diff --git a/python/slsdet/utils.py b/python/slsdet/utils.py
index ae7de4815..f7d4fbd9d 100755
--- a/python/slsdet/utils.py
+++ b/python/slsdet/utils.py
@@ -41,7 +41,7 @@ def list_to_bitmask(values):
     return mask
 
 def make_bitmask(args):
-    if isinstance(args, list):
+    if isinstance(args, (list,tuple)):
         return list_to_bitmask(args)
     elif isinstance(args, dict):
         return {key: list_to_bitmask(value) for key, value in args.items()}
diff --git a/python/src/detector.cpp b/python/src/detector.cpp
index 337630046..f34c141fd 100644
--- a/python/src/detector.cpp
+++ b/python/src/detector.cpp
@@ -73,9 +73,6 @@ void init_det(py::module &m) {
              (Result<int>(Detector::*)(sls::Positions) const) &
                  Detector::getModuleId,
              py::arg() = Positions{})
-        .def("setModuleId",
-             (void (Detector::*)(int, sls::Positions)) & Detector::setModuleId,
-             py::arg(), py::arg() = Positions{})
         .def("getReceiverVersion",
              (Result<int64_t>(Detector::*)(sls::Positions) const) &
                  Detector::getReceiverVersion,
diff --git a/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer b/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer
index 6ed2072cd..378ff747b 100755
Binary files a/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer and b/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer differ
diff --git a/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c
index 7c65c6bf0..e7f57a896 100644
--- a/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c
@@ -392,7 +392,7 @@ uint32_t getDetectorIP() {
 #ifdef VIRTUAL
     return 0;
 #endif
-    char temp[50] = "";
+    char temp[INET_ADDRSTRLEN] = "";
     uint32_t res = 0;
     // execute and get address
     char output[255];
@@ -1525,10 +1525,10 @@ int configureMAC() {
     int dstport = udpDetails[0].dstport;
 
     LOG(logINFOBLUE, ("Configuring MAC\n"));
-    char src_mac[50], src_ip[INET_ADDRSTRLEN], dst_mac[50],
-        dst_ip[INET_ADDRSTRLEN];
-    getMacAddressinString(src_mac, 50, srcmac);
-    getMacAddressinString(dst_mac, 50, dstmac);
+    char src_mac[MAC_ADDRESS_SIZE], src_ip[INET_ADDRSTRLEN],
+        dst_mac[MAC_ADDRESS_SIZE], dst_ip[INET_ADDRSTRLEN];
+    getMacAddressinString(src_mac, MAC_ADDRESS_SIZE, srcmac);
+    getMacAddressinString(dst_mac, MAC_ADDRESS_SIZE, dstmac);
     getIpAddressinString(src_ip, srcip);
     getIpAddressinString(dst_ip, dstip);
 
diff --git a/slsDetectorServers/eigerDetectorServer/bin/eigerDetectorServer_developer b/slsDetectorServers/eigerDetectorServer/bin/eigerDetectorServer_developer
index 100ec1ffd..0b6c2bff1 100755
Binary files a/slsDetectorServers/eigerDetectorServer/bin/eigerDetectorServer_developer and b/slsDetectorServers/eigerDetectorServer/bin/eigerDetectorServer_developer differ
diff --git a/slsDetectorServers/eigerDetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/eigerDetectorServer/slsDetectorFunctionList.c
index 0bfdcfb31..eb44e5aaa 100644
--- a/slsDetectorServers/eigerDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/eigerDetectorServer/slsDetectorFunctionList.c
@@ -263,7 +263,7 @@ u_int64_t getDetectorMAC() {
 }
 
 u_int32_t getDetectorIP() {
-    char temp[50] = "";
+    char temp[INET_ADDRSTRLEN] = "";
     u_int32_t res = 0;
     // execute and get address
     char output[255];
@@ -303,7 +303,7 @@ void initControlServer() {
     LOG(logINFOBLUE, ("Configuring Control server\n"));
     if (!updateFlag && initError == OK) {
 #ifndef VIRTUAL
-        int detid = getModuleIdInFile(&initError, initErrorMessage, ID_FILE);
+        int modid = getModuleIdInFile(&initError, initErrorMessage, ID_FILE);
 #else
         getModuleIdInFile(&initError, initErrorMessage, ID_FILE);
 #endif
@@ -342,7 +342,7 @@ void initControlServer() {
         LOG(logDEBUG1, ("Control server: FEB Initialization done\n"));
         Beb_SetTopVariable(top);
         Beb_Beb();
-        Beb_SetModuleId(detid);
+        Beb_SetModuleId(modid);
         LOG(logDEBUG1, ("Control server: BEB Initialization done\n"));
 #endif
         // also reads config file and deactivates
@@ -1531,10 +1531,10 @@ int configureMAC() {
         int dstport = udpDetails[iRxEntry].dstport;
         int dstport2 = udpDetails[iRxEntry].dstport2;
 
-        char src_mac[50], src_ip[INET_ADDRSTRLEN], dst_mac[50],
-            dst_ip[INET_ADDRSTRLEN];
-        getMacAddressinString(src_mac, 50, srcmac);
-        getMacAddressinString(dst_mac, 50, dstmac);
+        char src_mac[MAC_ADDRESS_SIZE], src_ip[INET_ADDRSTRLEN],
+            dst_mac[MAC_ADDRESS_SIZE], dst_ip[INET_ADDRSTRLEN];
+        getMacAddressinString(src_mac, MAC_ADDRESS_SIZE, srcmac);
+        getMacAddressinString(dst_mac, MAC_ADDRESS_SIZE, dstmac);
         getIpAddressinString(src_ip, srcip);
         getIpAddressinString(dst_ip, dstip);
 
diff --git a/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer b/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer
index db76d95d8..851a71620 100755
Binary files a/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer and b/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer differ
diff --git a/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c
index 084a50951..8c45ae8ed 100644
--- a/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c
@@ -288,16 +288,13 @@ u_int32_t getDetectorNumber() {
 }
 
 int getModuleId(int *ret, char *mess) {
-    return getModuleIdInFile(ret, mess, ID_FILE);
+    return ((bus_r(MOD_ID_REG) & ~MOD_ID_MSK) >> MOD_ID_OFST);
 }
 
-void setModuleId(int *ret, char *mess, int arg) {
-    *ret = setModuleIdInFile(mess, arg, ID_FILE);
-    if (*ret == FAIL) {
-        return;
-    }
+void setModuleId(int modid) {
+    LOG(logINFOBLUE, ("Setting module id in fpga: %d\n", modid))
     bus_w(MOD_ID_REG, bus_r(MOD_ID_REG) & ~MOD_ID_MSK);
-    bus_w(MOD_ID_REG, bus_r(MOD_ID_REG) | ((arg << MOD_ID_OFST) & MOD_ID_MSK));
+    bus_w(MOD_ID_REG, bus_r(MOD_ID_REG) | ((modid << MOD_ID_OFST) & MOD_ID_MSK));
 }
 
 u_int64_t getDetectorMAC() {
@@ -326,7 +323,7 @@ u_int32_t getDetectorIP() {
 #ifdef VIRTUAL
     return 0;
 #endif
-    char temp[50] = "";
+    char temp[INET_ADDRSTRLEN] = "";
     u_int32_t res = 0;
     // execute and get address
     char output[255];
@@ -422,10 +419,6 @@ void setupDetector() {
     sharedMemory_setStatus(IDLE);
     setupUDPCommParameters();
 #endif
-    getModuleIdInFile(&initError, initErrorMessage, ID_FILE);
-    if (initError == FAIL) {
-        return;
-    }
     // pll defines
     ALTERA_PLL_C10_SetDefines(REG_OFFSET, BASE_READOUT_PLL, BASE_SYSTEM_PLL,
                               PLL_RESET_REG, PLL_RESET_READOUT_MSK,
@@ -483,6 +476,14 @@ void setupDetector() {
     if (readConfigFile() == FAIL) {
         return;
     }
+
+    // set module id in register
+    int modid = getModuleIdInFile(&initError, initErrorMessage, ID_FILE);
+    if (initError == FAIL) {
+        return;
+    }
+    setModuleId(modid);
+
     setBurstMode(DEFAULT_BURST_MODE);
     setFilterResistor(DEFAULT_FILTER_RESISTOR);
     setCDSGain(DEFAILT_CDS_GAIN);
@@ -1749,16 +1750,16 @@ int configureMAC() {
     int dstport2 = udpDetails[0].dstport2;
 
     LOG(logINFOBLUE, ("Configuring MAC\n"));
-    char src_mac[50], src_ip[INET_ADDRSTRLEN], dst_mac[50],
-        dst_ip[INET_ADDRSTRLEN];
-    getMacAddressinString(src_mac, 50, srcmac);
-    getMacAddressinString(dst_mac, 50, dstmac);
+    char src_mac[MAC_ADDRESS_SIZE], src_ip[INET_ADDRSTRLEN],
+        dst_mac[MAC_ADDRESS_SIZE], dst_ip[INET_ADDRSTRLEN];
+    getMacAddressinString(src_mac, MAC_ADDRESS_SIZE, srcmac);
+    getMacAddressinString(dst_mac, MAC_ADDRESS_SIZE, dstmac);
     getIpAddressinString(src_ip, srcip);
     getIpAddressinString(dst_ip, dstip);
-    char src_mac2[50], src_ip2[INET_ADDRSTRLEN], dst_mac2[50],
-        dst_ip2[INET_ADDRSTRLEN];
-    getMacAddressinString(src_mac2, 50, srcmac2);
-    getMacAddressinString(dst_mac2, 50, dstmac2);
+    char src_mac2[MAC_ADDRESS_SIZE], src_ip2[INET_ADDRSTRLEN],
+        dst_mac2[MAC_ADDRESS_SIZE], dst_ip2[INET_ADDRSTRLEN];
+    getMacAddressinString(src_mac2, MAC_ADDRESS_SIZE, srcmac2);
+    getMacAddressinString(dst_mac2, MAC_ADDRESS_SIZE, dstmac2);
     getIpAddressinString(src_ip2, srcip2);
     getIpAddressinString(dst_ip2, dstip2);
 
diff --git a/slsDetectorServers/gotthardDetectorServer/bin/gotthardDetectorServer_developer b/slsDetectorServers/gotthardDetectorServer/bin/gotthardDetectorServer_developer
index ccb2bc6cd..08db997a4 100755
Binary files a/slsDetectorServers/gotthardDetectorServer/bin/gotthardDetectorServer_developer and b/slsDetectorServers/gotthardDetectorServer/bin/gotthardDetectorServer_developer differ
diff --git a/slsDetectorServers/gotthardDetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/gotthardDetectorServer/slsDetectorFunctionList.c
index 453493943..895042dd6 100644
--- a/slsDetectorServers/gotthardDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/gotthardDetectorServer/slsDetectorFunctionList.c
@@ -315,7 +315,7 @@ u_int32_t getDetectorIP() {
 #ifdef VIRTUAL
     return 0;
 #endif
-    char temp[50] = "";
+    char temp[INET_ADDRSTRLEN] = "";
     u_int32_t res = 0;
     // execute and get address
     char output[255];
@@ -1340,10 +1340,10 @@ int configureMAC() {
     int dstport = udpDetails[0].dstport;
 
     LOG(logINFOBLUE, ("Configuring MAC\n"));
-    char src_mac[50], src_ip[INET_ADDRSTRLEN], dst_mac[50],
-        dst_ip[INET_ADDRSTRLEN];
-    getMacAddressinString(src_mac, 50, srcmac);
-    getMacAddressinString(dst_mac, 50, dstmac);
+    char src_mac[MAC_ADDRESS_SIZE], src_ip[INET_ADDRSTRLEN],
+        dst_mac[MAC_ADDRESS_SIZE], dst_ip[INET_ADDRSTRLEN];
+    getMacAddressinString(src_mac, MAC_ADDRESS_SIZE, srcmac);
+    getMacAddressinString(dst_mac, MAC_ADDRESS_SIZE, dstmac);
     getIpAddressinString(src_ip, srcip);
     getIpAddressinString(dst_ip, dstip);
 
diff --git a/slsDetectorServers/jungfrauDetectorServer/bin/jungfrauDetectorServer_developer b/slsDetectorServers/jungfrauDetectorServer/bin/jungfrauDetectorServer_developer
index 229aeb1ac..b46df8aa2 100755
Binary files a/slsDetectorServers/jungfrauDetectorServer/bin/jungfrauDetectorServer_developer and b/slsDetectorServers/jungfrauDetectorServer/bin/jungfrauDetectorServer_developer differ
diff --git a/slsDetectorServers/jungfrauDetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/jungfrauDetectorServer/slsDetectorFunctionList.c
index efeb45544..a63984352 100644
--- a/slsDetectorServers/jungfrauDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/jungfrauDetectorServer/slsDetectorFunctionList.c
@@ -52,9 +52,6 @@ int detPos[4] = {};
 int chipVersion = 10; // (1.0)
 int chipConfigured = 0;
 
-// until firmware is done
-int temp_readNRows = 512;
-
 int isInitCheckDone() { return initCheckDone; }
 
 int getInitResult(char **mess) {
@@ -337,7 +334,7 @@ u_int32_t getDetectorIP() {
 #ifdef VIRTUAL
     return 0;
 #endif
-    char temp[50] = "";
+    char temp[INET_ADDRSTRLEN] = "";
     u_int32_t res = 0;
     // execute and get address
     char output[255];
@@ -1480,16 +1477,16 @@ int configureMAC() {
         int dstport = udpDetails[iRxEntry].dstport;
         int dstport2 = udpDetails[iRxEntry].dstport2;
 
-        char src_mac[50], src_ip[INET_ADDRSTRLEN], dst_mac[50],
-            dst_ip[INET_ADDRSTRLEN];
-        getMacAddressinString(src_mac, 50, srcmac);
-        getMacAddressinString(dst_mac, 50, dstmac);
+        char src_mac[MAC_ADDRESS_SIZE], src_ip[INET_ADDRSTRLEN],
+            dst_mac[MAC_ADDRESS_SIZE], dst_ip[INET_ADDRSTRLEN];
+        getMacAddressinString(src_mac, MAC_ADDRESS_SIZE, srcmac);
+        getMacAddressinString(dst_mac, MAC_ADDRESS_SIZE, dstmac);
         getIpAddressinString(src_ip, srcip);
         getIpAddressinString(dst_ip, dstip);
-        char src_mac2[50], src_ip2[INET_ADDRSTRLEN], dst_mac2[50],
-            dst_ip2[INET_ADDRSTRLEN];
-        getMacAddressinString(src_mac2, 50, srcmac2);
-        getMacAddressinString(dst_mac2, 50, dstmac2);
+        char src_mac2[MAC_ADDRESS_SIZE], src_ip2[INET_ADDRSTRLEN],
+            dst_mac2[MAC_ADDRESS_SIZE], dst_ip2[INET_ADDRSTRLEN];
+        getMacAddressinString(src_mac2, MAC_ADDRESS_SIZE, srcmac2);
+        getMacAddressinString(dst_mac2, MAC_ADDRESS_SIZE, dstmac2);
         getIpAddressinString(src_ip2, srcip2);
         getIpAddressinString(dst_ip2, dstip2);
 
@@ -1642,11 +1639,6 @@ int setReadNRows(int value) {
         return FAIL;
     }
 
-    // will be replaced when firmware is fixed
-    LOG(logWARNING, ("Setting number of rows: %d (Not implemented in firmware yet)\n", value));
-    temp_readNRows = value;
-    return OK;
-
     // regval is numpackets - 1 
     int regval = (value / READ_N_ROWS_MULTIPLE) - 1;
     uint32_t addr = READ_N_ROWS_REG;
@@ -1665,10 +1657,6 @@ int setReadNRows(int value) {
 }
 
 int getReadNRows() {
-    
-    // will be replaced when firmware is fixed
-    return temp_readNRows;
-
     int enable = (bus_r(READ_N_ROWS_REG) & READ_N_ROWS_ENBL_MSK);
     int regval = ((bus_r(READ_N_ROWS_REG) & READ_N_ROWS_NUM_ROWS_MSK) >> READ_N_ROWS_NUM_ROWS_OFST);
  
diff --git a/slsDetectorServers/moenchDetectorServer/bin/moenchDetectorServer_developer b/slsDetectorServers/moenchDetectorServer/bin/moenchDetectorServer_developer
index 83f6521bd..8342753d5 100755
Binary files a/slsDetectorServers/moenchDetectorServer/bin/moenchDetectorServer_developer and b/slsDetectorServers/moenchDetectorServer/bin/moenchDetectorServer_developer differ
diff --git a/slsDetectorServers/moenchDetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/moenchDetectorServer/slsDetectorFunctionList.c
index 45bda6da6..bdda08571 100644
--- a/slsDetectorServers/moenchDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/moenchDetectorServer/slsDetectorFunctionList.c
@@ -389,7 +389,7 @@ uint32_t getDetectorIP() {
 #ifdef VIRTUAL
     return 0;
 #endif
-    char temp[50] = "";
+    char temp[INET_ADDRSTRLEN] = "";
     uint32_t res = 0;
     // execute and get address
     char output[255];
@@ -1190,10 +1190,10 @@ int configureMAC() {
     int dstport = udpDetails[0].dstport;
 
     LOG(logINFOBLUE, ("Configuring MAC\n"));
-    char src_mac[50], src_ip[INET_ADDRSTRLEN], dst_mac[50],
-        dst_ip[INET_ADDRSTRLEN];
-    getMacAddressinString(src_mac, 50, srcmac);
-    getMacAddressinString(dst_mac, 50, dstmac);
+    char src_mac[MAC_ADDRESS_SIZE], src_ip[INET_ADDRSTRLEN],
+        dst_mac[MAC_ADDRESS_SIZE], dst_ip[INET_ADDRSTRLEN];
+    getMacAddressinString(src_mac, MAC_ADDRESS_SIZE, srcmac);
+    getMacAddressinString(dst_mac, MAC_ADDRESS_SIZE, dstmac);
     getIpAddressinString(src_ip, srcip);
     getIpAddressinString(dst_ip, dstip);
 
diff --git a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer b/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer
index b556b89d4..03ef8baef 100755
Binary files a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer and b/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer differ
diff --git a/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
index 6d3a22451..3d8c99b13 100644
--- a/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
@@ -312,7 +312,7 @@ u_int32_t getDetectorIP() {
 #ifdef VIRTUAL
     return 0;
 #endif
-    char temp[50] = "";
+    char temp[INET_ADDRSTRLEN] = "";
     u_int32_t res = 0;
     // execute and get address
     char output[255];
@@ -444,6 +444,14 @@ void setupDetector() {
     setASICDefaults();
     setADIFDefaults();
 
+    // set module id in register
+    getModuleIdInFile(&initError, initErrorMessage, ID_FILE);
+    if (initError == FAIL) {
+        return;
+    }
+    // until firmware is done
+    // setModuleId(modid);    
+
     // set trigger flow for m3 (for all timing modes)
     bus_w(FLOW_TRIGGER_REG, bus_r(FLOW_TRIGGER_REG) | FLOW_TRIGGER_MSK);
 
@@ -1720,10 +1728,10 @@ int configureMAC() {
     int dstport = udpDetails[0].dstport;
 
     LOG(logINFOBLUE, ("Configuring MAC\n"));
-    char src_mac[50], src_ip[INET_ADDRSTRLEN], dst_mac[50],
-        dst_ip[INET_ADDRSTRLEN];
-    getMacAddressinString(src_mac, 50, srcmac);
-    getMacAddressinString(dst_mac, 50, dstmac);
+    char src_mac[MAC_ADDRESS_SIZE], src_ip[INET_ADDRSTRLEN],
+        dst_mac[MAC_ADDRESS_SIZE], dst_ip[INET_ADDRSTRLEN];
+    getMacAddressinString(src_mac, MAC_ADDRESS_SIZE, srcmac);
+    getMacAddressinString(dst_mac, MAC_ADDRESS_SIZE, dstmac);
     getIpAddressinString(src_ip, srcip);
     getIpAddressinString(dst_ip, dstip);
 
diff --git a/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h b/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h
index 447d94ca5..8614e7672 100644
--- a/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h
+++ b/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h
@@ -52,6 +52,7 @@ typedef struct udpStruct_s {
     uint32_t dstip;
     uint32_t dstip2;
 } udpStruct;
+#define MAC_ADDRESS_SIZE 18
 
 // basic tests
 int isInitCheckDone();
@@ -96,7 +97,7 @@ u_int32_t getDetectorNumber();
 int getModuleId(int *ret, char *mess);
 #endif
 #ifdef GOTTHARD2D
-void setModuleId(int *ret, char *mess, int arg);
+void setModuleId(int modid);
 #endif
 u_int64_t getDetectorMAC();
 u_int32_t getDetectorIP();
diff --git a/slsDetectorServers/slsDetectorServer/include/slsDetectorServer_funcs.h b/slsDetectorServers/slsDetectorServer/include/slsDetectorServer_funcs.h
index 521b56ba3..da20ee922 100644
--- a/slsDetectorServers/slsDetectorServer/include/slsDetectorServer_funcs.h
+++ b/slsDetectorServers/slsDetectorServer/include/slsDetectorServer_funcs.h
@@ -268,7 +268,6 @@ int get_adc_pipeline(int);
 int set_dbit_pipeline(int);
 int get_dbit_pipeline(int);
 int get_module_id(int);
-int set_module_id(int);
 int get_dest_udp_list(int);
 int set_dest_udp_list(int);
 int get_num_dest_list(int);
diff --git a/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c b/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c
index f3e519edd..28372f103 100644
--- a/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c
+++ b/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c
@@ -404,7 +404,6 @@ void function_table() {
     flist[F_SET_DBIT_PIPELINE] = &set_dbit_pipeline;
     flist[F_GET_DBIT_PIPELINE] = &get_dbit_pipeline;
     flist[F_GET_MODULE_ID] = &get_module_id;
-    flist[F_SET_MODULE_ID] = &set_module_id;
     flist[F_GET_DEST_UDP_LIST] = &get_dest_udp_list;
     flist[F_SET_DEST_UDP_LIST] = &set_dest_udp_list;
     flist[F_GET_NUM_DEST_UDP] = &get_num_dest_list;
@@ -1760,8 +1759,8 @@ int acquire(int blocking, int file_des) {
             if (udpDetails[0].srcmac != getDetectorMAC()) {
             ret = FAIL;
             uint64_t sourcemac = getDetectorMAC();
-            char src_mac[50];
-            getMacAddressinString(src_mac, 50, sourcemac);
+            char src_mac[MAC_ADDRESS_SIZE];
+            getMacAddressinString(src_mac, MAC_ADDRESS_SIZE, sourcemac);
             sprintf(mess,
                     "Invalid udp source mac address for this detector. Must be "
                     "same as hardware detector mac address %s\n",
@@ -4875,8 +4874,8 @@ void calculate_and_set_position() {
     else {
         // create detector mac from x and y
         if (udpDetails[0].srcmac == 0) {
-            char dmac[50];
-            memset(dmac, 0, 50);
+            char dmac[MAC_ADDRESS_SIZE];
+            memset(dmac, 0, MAC_ADDRESS_SIZE);
             sprintf(dmac, "aa:bb:cc:dd:%02x:%02x", pos[0] & 0xFF,
                     pos[1] & 0xFF);
             LOG(logINFO, ("Udp source mac address created: %s\n", dmac));
@@ -4895,8 +4894,8 @@ void calculate_and_set_position() {
 #if defined(JUNGFRAUD) || defined(GOTTHARD2D)
         if (getNumberofUDPInterfaces() > 1) {
             if (udpDetails[0].srcmac2 == 0) {
-                char dmac2[50];
-                memset(dmac2, 0, 50);
+                char dmac2[MAC_ADDRESS_SIZE];
+                memset(dmac2, 0, MAC_ADDRESS_SIZE);
                 sprintf(dmac2, "aa:bb:cc:dd:%02x:%02x", (pos[0] + 1) & 0xFF,
                         pos[1] & 0xFF);
                 LOG(logINFO, ("Udp source mac address2 created: %s\n", dmac2));
@@ -9034,34 +9033,6 @@ int get_module_id(int file_des) {
     return Server_SendResult(file_des, INT32, &retval, sizeof(retval));
 }
 
-int set_module_id(int file_des) {
-    ret = OK;
-    memset(mess, 0, sizeof(mess));
-    int arg = -1;
-
-    if (receiveData(file_des, &arg, sizeof(arg), INT32) < 0)
-        return printSocketReadError();
-    LOG(logDEBUG1, ("Setting module id to 0x%x\n", arg));
-
-#ifndef GOTTHARD2D
-    functionNotImplemented();
-#else
-    if (arg > 0xFFFF) {
-        ret = FAIL;
-        sprintf(mess, "Could not set module id. Max value: 0x%x\n", 0xFFFF);
-        LOG(logERROR, (mess));
-    } else {
-        setModuleId(&ret, mess, arg);
-        if (ret != FAIL) {
-            int retval = getModuleId(&ret, mess);
-            LOG(logDEBUG1, ("retval module id: %d\n", retval));
-            validate(&ret, mess, arg, retval, "set module id", DEC);
-        }
-    }
-#endif
-    return Server_SendResult(file_des, INT32, NULL, 0);
-}
-
 int get_dest_udp_list(int file_des) {
     ret = OK;
     memset(mess, 0, sizeof(mess));
@@ -9100,9 +9071,9 @@ int get_dest_udp_list(int file_des) {
         char ip[INET_ADDRSTRLEN], ip2[INET_ADDRSTRLEN];
         getIpAddressinString(ip, retvals[3]);
         getIpAddressinString(ip2, retvals[4]);
-        char mac[50], mac2[50];
-        getMacAddressinString(mac, 50, retvals64[0]);
-        getMacAddressinString(mac2, 50, retvals64[1]);
+        char mac[MAC_ADDRESS_SIZE], mac2[MAC_ADDRESS_SIZE];
+        getMacAddressinString(mac, MAC_ADDRESS_SIZE, retvals64[0]);
+        getMacAddressinString(mac2, MAC_ADDRESS_SIZE, retvals64[1]);
         LOG(logDEBUG1,
             ("Udp Dest. retval [%d]: [port %d, port2 %d, ip %s, ip2 %s, "
              "mac %s, mac2 %s]\n",
@@ -9136,9 +9107,9 @@ int set_dest_udp_list(int file_des) {
     char ip[INET_ADDRSTRLEN], ip2[INET_ADDRSTRLEN];
     getIpAddressinString(ip, args[3]);
     getIpAddressinString(ip2, args[4]);
-    char mac[50], mac2[50];
-    getMacAddressinString(mac, 50, args64[0]);
-    getMacAddressinString(mac2, 50, args64[1]);
+    char mac[MAC_ADDRESS_SIZE], mac2[MAC_ADDRESS_SIZE];
+    getMacAddressinString(mac, MAC_ADDRESS_SIZE, args64[0]);
+    getMacAddressinString(mac2, MAC_ADDRESS_SIZE, args64[1]);
 
 #if !defined(EIGERD) && !defined(JUNGFRAUD)
     functionNotImplemented();
diff --git a/slsDetectorSoftware/include/sls/Detector.h b/slsDetectorSoftware/include/sls/Detector.h
index 960c0545d..420f605de 100644
--- a/slsDetectorSoftware/include/sls/Detector.h
+++ b/slsDetectorSoftware/include/sls/Detector.h
@@ -81,13 +81,9 @@ class Detector {
     /* [Jungfrau][Gotthard][Mythen3][Gotthard2][CTB][Moench] */
     Result<int64_t> getSerialNumber(Positions pos = {}) const;
 
-    /** [Eiger][Gotthard2][Mythen3] */
+    /** [Eiger][Gotthard2][Mythen3] 6 bit value (ideally unique) that is streamed out in the UDP header of the detector.*/
     Result<int> getModuleId(Positions pos = {}) const;
 
-    /** [Gotthard2] 6 bit value (ideally unique) that is "
-        "streamed out1 in the UDP header of the detector.  */
-    void setModuleId(const int value, Positions pos = {});
-
     Result<int64_t> getReceiverVersion(Positions pos = {}) const;
 
     /** Options: EIGER, JUNGFRAU, GOTTHARD, MOENCH, MYTHEN3, GOTTHARD2,
@@ -667,10 +663,10 @@ class Detector {
     /** [Jungfrau] bottom half [Gotthard2] veto debugging */
     void setSourceUDPMAC2(const MacAddr mac, Positions pos = {});
 
-    Result<defs::udpDestination>
-    getDestinationUDPList(const uint32_t entry, Positions pos = {}) const;
+    Result<UdpDestination> getDestinationUDPList(const uint32_t entry,
+                                                 Positions pos = {}) const;
 
-    void setDestinationUDPList(const defs::udpDestination, const int module_id);
+    void setDestinationUDPList(const UdpDestination, const int module_id);
 
     /** [Jungfrau][Eiger] */
     Result<int> getNumberofUDPDestinations(Positions pos = {}) const;
diff --git a/slsDetectorSoftware/src/CmdProxy.cpp b/slsDetectorSoftware/src/CmdProxy.cpp
index ee5c5edda..2f66ad821 100644
--- a/slsDetectorSoftware/src/CmdProxy.cpp
+++ b/slsDetectorSoftware/src/CmdProxy.cpp
@@ -1379,15 +1379,8 @@ IpAddr CmdProxy::getIpFromAuto() {
     return val;
 }
 
-defs::udpDestination CmdProxy::getUdpList() {
-    uint32_t entry{};
-    uint32_t port{};
-    uint32_t port2{};
-    uint32_t ip{};
-    uint32_t ip2{};
-    uint64_t mac{};
-    uint64_t mac2{};
-
+UdpDestination CmdProxy::getUdpEntry() {
+    UdpDestination udpDestination{};
     bool hasEntry = false;
 
     for (auto it : args) {
@@ -1395,40 +1388,40 @@ defs::udpDestination CmdProxy::getUdpList() {
         std::string key = it.substr(0, pos);
         std::string value = it.substr(pos + 1);
         if (key == "entry") {
-            entry = StringTo<int>(value);
+            udpDestination.entry = StringTo<int>(value);
             hasEntry = true;
         } else if (key == "ip") {
             if (value == "auto") {
                 auto val = getIpFromAuto();
                 LOG(logINFO) << "Setting udp_dstip of detector " << det_id
                              << " to " << val;
-                ip = val.uint32();
+                udpDestination.ip = val;
             } else {
-                ip = IpAddr(value).uint32();
+                udpDestination.ip = IpAddr(value);
             }
         } else if (key == "ip2") {
             if (value == "auto") {
                 auto val = getIpFromAuto();
                 LOG(logINFO) << "Setting udp_dstip2 of detector " << det_id
                              << " to " << val;
-                ip2 = val.uint32();
+                udpDestination.ip2 = val;
             } else {
-                ip2 = IpAddr(value).uint32();
+                udpDestination.ip2 = IpAddr(value);
             }
         } else if (key == "mac") {
-            mac = MacAddr(value).uint64();
+            udpDestination.mac = MacAddr(value);
         } else if (key == "mac2") {
-            mac2 = MacAddr(value).uint64();
+            udpDestination.mac2 = MacAddr(value);
         } else if (key == "port") {
-            port = StringTo<uint32_t>(value);
+            udpDestination.port = StringTo<uint32_t>(value);
         } else if (key == "port2") {
-            port2 = StringTo<uint32_t>(value);
+            udpDestination.port2 = StringTo<uint32_t>(value);
         }
     }
     if (!hasEntry) {
         throw sls::RuntimeError("Found no entry argument.");
     }
-    return defs::udpDestination(entry, port, ip, mac, port2, ip2, mac2);
+    return udpDestination;
 }
 
 std::string CmdProxy::UDPDestinationList(int action) {
@@ -1454,7 +1447,7 @@ std::string CmdProxy::UDPDestinationList(int action) {
         if (args.empty()) {
             WrongNumberOfParameters(1);
         }
-        auto t = getUdpList();
+        auto t = getUdpEntry();
         det->setDestinationUDPList(t, det_id);
         os << ToString(args) << std::endl;
     } else {
diff --git a/slsDetectorSoftware/src/CmdProxy.h b/slsDetectorSoftware/src/CmdProxy.h
index d1e536f37..e2834d957 100644
--- a/slsDetectorSoftware/src/CmdProxy.h
+++ b/slsDetectorSoftware/src/CmdProxy.h
@@ -1117,7 +1117,7 @@ class CmdProxy {
     std::string Trigger(int action);
     /* Network Configuration (Detector<->Receiver) */
     IpAddr getIpFromAuto();
-    slsDetectorDefs::udpDestination getUdpList();
+    UdpDestination getUdpEntry();
     std::string UDPDestinationList(int action);
     std::string UDPDestinationIP(int action);
     std::string UDPDestinationIP2(int action);
@@ -1203,11 +1203,10 @@ class CmdProxy {
                     "\n\t[Jungfrau][Gotthard][Mythen3][Gotthard2][CTB][Moench]"
                     "Serial number of detector.");
 
-    INTEGER_COMMAND_HEX(
-        moduleid, getModuleId, setModuleId, StringTo<int>,
-        "[value]\n\t[Gotthard2][Eiger][Mythen3] 16 bit value (ideally unique) "
-        "that is streamed out in the UDP header of the detector. "
-        "\n\t[Gotthard2] Can set it too.");
+    GET_COMMAND_HEX(
+        moduleid, getModuleId, 
+        "\n\t[Gotthard2][Eiger][Mythen3] 16 bit value (ideally unique) "
+        "that is streamed out in the UDP header of the detector. Picked up from a file on the module.");
 
     GET_COMMAND(type, getDetectorType,
                 "\n\tReturns detector type. Can be Eiger, Jungfrau, Gotthard, "
diff --git a/slsDetectorSoftware/src/Detector.cpp b/slsDetectorSoftware/src/Detector.cpp
index 3e316e984..80c6c0c0e 100644
--- a/slsDetectorSoftware/src/Detector.cpp
+++ b/slsDetectorSoftware/src/Detector.cpp
@@ -123,10 +123,6 @@ Result<int> Detector::getModuleId(Positions pos) const {
     return pimpl->Parallel(&Module::getModuleId, pos);
 }
 
-void Detector::setModuleId(const int value, Positions pos) {
-    pimpl->Parallel(&Module::setModuleId, pos, value);
-}
-
 Result<int64_t> Detector::getReceiverVersion(Positions pos) const {
     return pimpl->Parallel(&Module::getReceiverSoftwareVersion, pos);
 }
@@ -908,12 +904,12 @@ void Detector::setSourceUDPMAC2(const MacAddr mac, Positions pos) {
     pimpl->Parallel(&Module::setSourceUDPMAC2, pos, mac);
 }
 
-Result<defs::udpDestination>
-Detector::getDestinationUDPList(const uint32_t entry, Positions pos) const {
+Result<UdpDestination> Detector::getDestinationUDPList(const uint32_t entry,
+                                                       Positions pos) const {
     return pimpl->Parallel(&Module::getDestinationUDPList, pos, entry);
 }
 
-void Detector::setDestinationUDPList(const defs::udpDestination dest,
+void Detector::setDestinationUDPList(const UdpDestination dest,
                                      const int module_id) {
     if (module_id == -1 && size() > 1) {
         throw sls::RuntimeError("Cannot set this parameter at detector level.");
diff --git a/slsDetectorSoftware/src/Module.cpp b/slsDetectorSoftware/src/Module.cpp
index ef1bfbd49..aeb2f393c 100644
--- a/slsDetectorSoftware/src/Module.cpp
+++ b/slsDetectorSoftware/src/Module.cpp
@@ -27,8 +27,8 @@
 namespace sls {
 
 // creating new shm
-Module::Module(detectorType type, int det_id, int module_id, bool verify)
-    : moduleId(module_id), shm(det_id, module_id) {
+Module::Module(detectorType type, int det_id, int module_index, bool verify)
+    : moduleIndex(module_index), shm(det_id, module_index) {
 
     // ensure shared memory was not created before
     if (shm.IsExisting()) {
@@ -42,8 +42,8 @@ Module::Module(detectorType type, int det_id, int module_id, bool verify)
 }
 
 // opening existing shm
-Module::Module(int det_id, int module_id, bool verify)
-    : moduleId(module_id), shm(det_id, module_id) {
+Module::Module(int det_id, int module_index, bool verify)
+    : moduleIndex(module_index), shm(det_id, module_index) {
 
     // getDetectorType From shm will check if existing
     detectorType type = getDetectorTypeFromShm(det_id, verify);
@@ -98,10 +98,6 @@ int64_t Module::getSerialNumber() const {
 
 int Module::getModuleId() const { return sendToDetector<int>(F_GET_MODULE_ID); }
 
-void Module::setModuleId(const int value) {
-    return sendToDetector(F_SET_MODULE_ID, value, nullptr);
-}
-
 int64_t Module::getReceiverSoftwareVersion() const {
     if (shm()->useReceiverFlag) {
         return sendToReceiver<int64_t>(F_GET_RECEIVER_VERSION);
@@ -144,7 +140,7 @@ slsDetectorDefs::xy Module::getNumberOfChannels() const {
 
 void Module::updateNumberOfDetector(slsDetectorDefs::xy det) {
     shm()->numberOfDetector = det;
-    int args[2] = {shm()->numberOfDetector.y, moduleId};
+    int args[2] = {shm()->numberOfDetector.y, moduleIndex};
     sendToDetector(F_SET_POSITION, args, nullptr);
 }
 
@@ -825,13 +821,13 @@ std::vector<uint64_t> Module::getNumMissingPackets() const {
         auto client = ReceiverSocket(shm()->rxHostname, shm()->rxTCPPort);
         client.Send(F_GET_NUM_MISSING_PACKETS);
         if (client.Receive<int>() == FAIL) {
-            throw RuntimeError("Receiver " + std::to_string(moduleId) +
+            throw RuntimeError("Receiver " + std::to_string(moduleIndex) +
                                " returned error: " + client.readErrorMessage());
         } else {
             auto nports = client.Receive<int>();
             std::vector<uint64_t> retval(nports);
             client.Receive(retval);
-            LOG(logDEBUG1) << "Missing packets of Receiver" << moduleId << ": "
+            LOG(logDEBUG1) << "Missing packets of Receiver" << moduleIndex << ": "
                            << sls::ToString(retval);
             return retval;
         }
@@ -941,31 +937,30 @@ void Module::setSourceUDPMAC2(const sls::MacAddr mac) {
     sendToDetector(F_SET_SOURCE_UDP_MAC2, mac, nullptr);
 }
 
-slsDetectorDefs::udpDestination
-Module::getDestinationUDPList(const uint32_t entry) const {
-    return sendToDetector<udpDestination>(F_GET_DEST_UDP_LIST, entry);
+sls::UdpDestination Module::getDestinationUDPList(const uint32_t entry) const {
+    return sendToDetector<sls::UdpDestination>(F_GET_DEST_UDP_LIST, entry);
 }
 
-void Module::setDestinationUDPList(const slsDetectorDefs::udpDestination dest) {
+void Module::setDestinationUDPList(const sls::UdpDestination dest) {
     // set them in the default way so the receivers are also set up
-    if (dest.entry_ == 0) {
-        if (dest.port_ != 0) {
-            setDestinationUDPPort(dest.port_);
+    if (dest.entry == 0) {
+        if (dest.port != 0) {
+            setDestinationUDPPort(dest.port);
         }
-        if (dest.ip_ != 0) {
-            setDestinationUDPIP(IpAddr(dest.ip_));
+        if (dest.ip != 0) {
+            setDestinationUDPIP(dest.ip);
         }
-        if (dest.mac_ != 0) {
-            setDestinationUDPMAC(MacAddr(dest.mac_));
+        if (dest.mac != 0) {
+            setDestinationUDPMAC(dest.mac);
         }
-        if (dest.port2_ != 0) {
-            setDestinationUDPPort2(dest.port2_);
+        if (dest.port2 != 0) {
+            setDestinationUDPPort2(dest.port2);
         }
-        if (dest.ip2_ != 0) {
-            setDestinationUDPIP2(IpAddr(dest.ip2_));
+        if (dest.ip2 != 0) {
+            setDestinationUDPIP2(dest.ip2);
         }
-        if (dest.mac2_ != 0) {
-            setDestinationUDPMAC2(MacAddr(dest.mac2_));
+        if (dest.mac2 != 0) {
+            setDestinationUDPMAC2(dest.mac2);
         }
     } else {
         sendToDetector(F_SET_DEST_UDP_LIST, dest, nullptr);
@@ -1000,7 +995,7 @@ void Module::setDestinationUDPIP(const IpAddr ip) {
     if (shm()->useReceiverFlag) {
         sls::MacAddr retval(0LU);
         sendToReceiver(F_SET_RECEIVER_UDP_IP, ip, retval);
-        LOG(logINFO) << "Setting destination udp mac of detector " << moduleId
+        LOG(logINFO) << "Setting destination udp mac of detector " << moduleIndex
                      << " to " << retval;
         sendToDetector(F_SET_DEST_UDP_MAC, retval, nullptr);
     }
@@ -1020,7 +1015,7 @@ void Module::setDestinationUDPIP2(const IpAddr ip) {
     if (shm()->useReceiverFlag) {
         sls::MacAddr retval(0LU);
         sendToReceiver(F_SET_RECEIVER_UDP_IP2, ip, retval);
-        LOG(logINFO) << "Setting destination udp mac2 of detector " << moduleId
+        LOG(logINFO) << "Setting destination udp mac2 of detector " << moduleIndex
                      << " to " << retval;
         sendToDetector(F_SET_DEST_UDP_MAC2, retval, nullptr);
     }
@@ -1078,7 +1073,7 @@ void Module::validateUDPConfiguration() {
 
 std::string Module::printReceiverConfiguration() {
     std::ostringstream os;
-    os << "\n\nDetector " << moduleId << "\nReceiver Hostname:\t"
+    os << "\n\nDetector " << moduleIndex << "\nReceiver Hostname:\t"
        << getReceiverHostname();
 
     if (shm()->myDetectorType == JUNGFRAU) {
@@ -1192,7 +1187,7 @@ void Module::setReceiverHostname(const std::string &receiverIP) {
     retval.detType = shm()->myDetectorType;
     retval.numberOfDetector.x = shm()->numberOfDetector.x;
     retval.numberOfDetector.y = shm()->numberOfDetector.y;
-    retval.moduleId = moduleId;
+    retval.moduleIndex = moduleIndex;
     memset(retval.hostname, 0, sizeof(retval.hostname));
     strcpy_safe(retval.hostname, shm()->hostname);
 
@@ -1202,13 +1197,13 @@ void Module::setReceiverHostname(const std::string &receiverIP) {
     if (retval.udp_dstmac == 0 && retvals[0] != 0) {
         LOG(logINFO) << "Setting destination udp mac of "
                         "detector "
-                     << moduleId << " to " << retvals[0];
+                     << moduleIndex << " to " << retvals[0];
         sendToDetector(F_SET_DEST_UDP_MAC, retvals[0], nullptr);
     }
     if (retval.udp_dstmac2 == 0 && retvals[1] != 0) {
         LOG(logINFO) << "Setting destination udp mac2 of "
                         "detector "
-                     << moduleId << " to " << retvals[1];
+                     << moduleIndex << " to " << retvals[1];
         sendToDetector(F_SET_DEST_UDP_MAC2, retvals[1], nullptr);
     }
 
@@ -1524,7 +1519,7 @@ void Module::sendReceiverRateCorrections(const std::vector<int64_t> &t) {
     receiver.Send(static_cast<int>(t.size()));
     receiver.Send(t);
     if (receiver.Receive<int>() == FAIL) {
-        throw RuntimeError("Receiver " + std::to_string(moduleId) +
+        throw RuntimeError("Receiver " + std::to_string(moduleIndex) +
                            " returned error: " + receiver.readErrorMessage());
     }
 }
@@ -1789,7 +1784,7 @@ void Module::sendVetoPhoton(const int chipIndex,
     client.Send(gainIndices);
     client.Send(values);
     if (client.Receive<int>() == FAIL) {
-        throw RuntimeError("Detector " + std::to_string(moduleId) +
+        throw RuntimeError("Detector " + std::to_string(moduleIndex) +
                            " returned error: " + client.readErrorMessage());
     }
 }
@@ -1801,7 +1796,7 @@ void Module::getVetoPhoton(const int chipIndex,
     client.Send(F_GET_VETO_PHOTON);
     client.Send(chipIndex);
     if (client.Receive<int>() == FAIL) {
-        throw RuntimeError("Detector " + std::to_string(moduleId) +
+        throw RuntimeError("Detector " + std::to_string(moduleIndex) +
                            " returned error: " + client.readErrorMessage());
     }
 
@@ -2036,7 +2031,7 @@ void Module::getBadChannels(const std::string &fname) const {
     auto client = DetectorSocket(shm()->hostname, shm()->controlPort);
     client.Send(F_GET_BAD_CHANNELS);
     if (client.Receive<int>() == FAIL) {
-        throw RuntimeError("Detector " + std::to_string(moduleId) +
+        throw RuntimeError("Detector " + std::to_string(moduleIndex) +
                            " returned error: " + client.readErrorMessage());
     }
     // receive badchannels
@@ -2093,7 +2088,7 @@ void Module::setBadChannels(const std::string &fname) {
         client.Send(badchannels);
     }
     if (client.Receive<int>() == FAIL) {
-        throw RuntimeError("Detector " + std::to_string(moduleId) +
+        throw RuntimeError("Detector " + std::to_string(moduleIndex) +
                            " returned error: " + client.readErrorMessage());
     }
 }
@@ -2407,7 +2402,7 @@ std::map<std::string, std::string> Module::getAdditionalJsonHeader() const {
     auto client = ReceiverSocket(shm()->rxHostname, shm()->rxTCPPort);
     client.Send(F_GET_ADDITIONAL_JSON_HEADER);
     if (client.Receive<int>() == FAIL) {
-        throw RuntimeError("Receiver " + std::to_string(moduleId) +
+        throw RuntimeError("Receiver " + std::to_string(moduleIndex) +
                            " returned error: " + client.readErrorMessage());
     } else {
         auto size = client.Receive<int>();
@@ -2456,7 +2451,7 @@ void Module::setAdditionalJsonHeader(
         client.Send(&buff[0], buff.size());
 
     if (client.Receive<int>() == FAIL) {
-        throw RuntimeError("Receiver " + std::to_string(moduleId) +
+        throw RuntimeError("Receiver " + std::to_string(moduleIndex) +
                            " returned error: " + client.readErrorMessage());
     }
 }
@@ -3010,7 +3005,7 @@ slsDetectorDefs::detectorType Module::getDetectorTypeFromShm(int det_id,
     shm.OpenSharedMemory();
     if (verify && shm()->shmversion != SLS_SHMVERSION) {
         std::ostringstream ss;
-        ss << "Single shared memory (" << det_id << "-" << moduleId
+        ss << "Single shared memory (" << det_id << "-" << moduleIndex
            << ":)version mismatch (expected 0x" << std::hex << SLS_SHMVERSION
            << " but got 0x" << shm()->shmversion << ")" << std::dec
            << ". Clear Shared memory to continue.";
@@ -3021,7 +3016,7 @@ slsDetectorDefs::detectorType Module::getDetectorTypeFromShm(int det_id,
 }
 
 void Module::initSharedMemory(detectorType type, int det_id, bool verify) {
-    shm = SharedMemory<sharedSlsDetector>(det_id, moduleId);
+    shm = SharedMemory<sharedSlsDetector>(det_id, moduleIndex);
     if (!shm.IsExisting()) {
         shm.CreateSharedMemory();
         initializeDetectorStructure(type);
@@ -3029,7 +3024,7 @@ void Module::initSharedMemory(detectorType type, int det_id, bool verify) {
         shm.OpenSharedMemory();
         if (verify && shm()->shmversion != SLS_SHMVERSION) {
             std::ostringstream ss;
-            ss << "Single shared memory (" << det_id << "-" << moduleId
+            ss << "Single shared memory (" << det_id << "-" << moduleIndex
                << ":) version mismatch (expected 0x" << std::hex
                << SLS_SHMVERSION << " but got 0x" << shm()->shmversion << ")"
                << std::dec << ". Clear Shared memory to continue.";
@@ -3051,7 +3046,7 @@ void Module::initializeDetectorStructure(detectorType type) {
     shm()->rxTCPPort = DEFAULT_PORTNO + 2;
     shm()->useReceiverFlag = false;
     shm()->zmqport = DEFAULT_ZMQ_CL_PORTNO +
-                     (moduleId * ((shm()->myDetectorType == EIGER) ? 2 : 1));
+                     (moduleIndex * ((shm()->myDetectorType == EIGER) ? 2 : 1));
     shm()->zmqip = IpAddr{};
     shm()->numUDPInterfaces = 1;
     shm()->stoppedFlag = false;
@@ -3164,7 +3159,7 @@ void Module::setModule(sls_detector_module &module, bool trimbits) {
     client.Send(F_SET_MODULE);
     sendModule(&module, client);
     if (client.Receive<int>() == FAIL) {
-        throw RuntimeError("Detector " + std::to_string(moduleId) +
+        throw RuntimeError("Detector " + std::to_string(moduleIndex) +
                            " returned error: " + client.readErrorMessage());
     }
 }
@@ -3177,7 +3172,7 @@ void Module::updateReceiverStreamingIP() {
         if (ip == 0) {
             ip = HostnameToIp(shm()->rxHostname);
         }
-        LOG(logINFO) << "Setting default receiver " << moduleId
+        LOG(logINFO) << "Setting default receiver " << moduleIndex
                      << " streaming zmq ip to " << ip;
     }
     setReceiverStreamingIP(ip);
@@ -3426,7 +3421,7 @@ std::string Module::calculateChecksum(char *buffer, ssize_t bytes) {
 void Module::programFPGAviaBlackfin(std::vector<char> buffer) {
     // send program from memory to detector
     LOG(logINFO) << "Sending programming binary (from pof) to module "
-                 << moduleId << " (" << shm()->hostname << ")";
+                 << moduleIndex << " (" << shm()->hostname << ")";
     auto client = DetectorSocket(shm()->hostname, shm()->controlPort);
     client.Send(F_PROGRAM_FPGA);
     uint64_t filesize = buffer.size();
@@ -3444,7 +3439,7 @@ void Module::programFPGAviaBlackfin(std::vector<char> buffer) {
     if (client.Receive<int>() == FAIL) {
         std::cout << '\n';
         std::ostringstream os;
-        os << "Detector " << moduleId << " (" << shm()->hostname << ")"
+        os << "Detector " << moduleIndex << " (" << shm()->hostname << ")"
            << " returned error: " << client.readErrorMessage();
         throw RuntimeError(os.str());
     }
@@ -3464,7 +3459,7 @@ void Module::programFPGAviaBlackfin(std::vector<char> buffer) {
         if (client.Receive<int>() == FAIL) {
             std::cout << '\n';
             std::ostringstream os;
-            os << "Detector " << moduleId << " (" << shm()->hostname << ")"
+            os << "Detector " << moduleIndex << " (" << shm()->hostname << ")"
                << " returned error: " << client.readErrorMessage();
             throw RuntimeError(os.str());
         }
@@ -3475,22 +3470,22 @@ void Module::programFPGAviaBlackfin(std::vector<char> buffer) {
     // checksum 
     if (client.Receive<int>() == FAIL) {
         std::ostringstream os;
-        os << "Detector " << moduleId << " (" << shm()->hostname << ")"
+        os << "Detector " << moduleIndex << " (" << shm()->hostname << ")"
            << " returned error: " << client.readErrorMessage();
         throw RuntimeError(os.str());
     }
-    if (moduleId == 0) {
+    if (moduleIndex == 0) {
         LOG(logINFO) << "Checksum verified";
     }
 
     // copied to flash
     if (client.Receive<int>() == FAIL) {
         std::ostringstream os;
-        os << "Detector " << moduleId << " (" << shm()->hostname << ")"
+        os << "Detector " << moduleIndex << " (" << shm()->hostname << ")"
            << " returned error: " << client.readErrorMessage();
         throw RuntimeError(os.str());
     }
-    if (moduleId == 0) {
+    if (moduleIndex == 0) {
         LOG(logINFO) << "Copied to flash and checksum verified";
     }
 
@@ -3500,7 +3495,7 @@ void Module::programFPGAviaBlackfin(std::vector<char> buffer) {
 
 void Module::programFPGAviaNios(std::vector<char> buffer) {
     LOG(logINFO) << "Sending programming binary (from rbf) to detector "
-                 << moduleId << " (" << shm()->hostname << ")";
+                 << moduleIndex << " (" << shm()->hostname << ")";
 
     auto client = DetectorSocket(shm()->hostname, shm()->controlPort);
     client.Send(F_PROGRAM_FPGA);
@@ -3517,14 +3512,14 @@ void Module::programFPGAviaNios(std::vector<char> buffer) {
 
     if (client.Receive<int>() == FAIL) {
         std::ostringstream os;
-        os << "Detector " << moduleId << " (" << shm()->hostname << ")"
+        os << "Detector " << moduleIndex << " (" << shm()->hostname << ")"
            << " returned error: " << client.readErrorMessage();
         throw RuntimeError(os.str());
     }
     client.Send(buffer);
     if (client.Receive<int>() == FAIL) {
         std::ostringstream os;
-        os << "Detector " << moduleId << " (" << shm()->hostname << ")"
+        os << "Detector " << moduleIndex << " (" << shm()->hostname << ")"
            << " returned error: " << client.readErrorMessage();
         throw RuntimeError(os.str());
     }
diff --git a/slsDetectorSoftware/src/Module.h b/slsDetectorSoftware/src/Module.h
index d2bbe47f1..b6b1439d1 100644
--- a/slsDetectorSoftware/src/Module.h
+++ b/slsDetectorSoftware/src/Module.h
@@ -66,12 +66,12 @@ class Module : public virtual slsDetectorDefs {
 
     /** creating new shared memory
     verify is if shared memory version matches existing one */
-    explicit Module(detectorType type, int det_id = 0, int module_id = 0,
+    explicit Module(detectorType type, int det_id = 0, int module_index = 0,
                     bool verify = true);
 
     /** opening existing shared memory
     verify is if shared memory version matches existing one */
-    explicit Module(int det_id = 0, int module_id = 0, bool verify = true);
+    explicit Module(int det_id = 0, int module_index = 0, bool verify = true);
 
     virtual ~Module();
 
@@ -91,7 +91,6 @@ class Module : public virtual slsDetectorDefs {
     int64_t getDetectorServerVersion() const;
     int64_t getSerialNumber() const;
     int getModuleId() const;
-    void setModuleId(const int value);
     int64_t getReceiverSoftwareVersion() const;
     static detectorType getTypeFromDetector(const std::string &hostname,
                                             int cport = DEFAULT_PORTNO);
@@ -222,8 +221,8 @@ class Module : public virtual slsDetectorDefs {
     void setSourceUDPMAC(const sls::MacAddr mac);
     sls::MacAddr getSourceUDPMAC2() const;
     void setSourceUDPMAC2(const sls::MacAddr mac);
-    udpDestination getDestinationUDPList(const uint32_t entry) const;
-    void setDestinationUDPList(const defs::udpDestination dest);
+    sls::UdpDestination getDestinationUDPList(const uint32_t entry) const;
+    void setDestinationUDPList(const sls::UdpDestination dest);
     int getNumberofUDPDestinations() const;
     void setNumberofUDPDestinations(const int value);
     int getFirstUDPDestination() const;
@@ -748,7 +747,7 @@ class Module : public virtual slsDetectorDefs {
     void programFPGAviaBlackfin(std::vector<char> buffer);
     void programFPGAviaNios(std::vector<char> buffer);
 
-    const int moduleId;
+    const int moduleIndex;
     mutable sls::SharedMemory<sharedSlsDetector> shm{0, 0};
 };
 
diff --git a/slsReceiverSoftware/src/ClientInterface.cpp b/slsReceiverSoftware/src/ClientInterface.cpp
index afbd2f168..b4d7464db 100644
--- a/slsReceiverSoftware/src/ClientInterface.cpp
+++ b/slsReceiverSoftware/src/ClientInterface.cpp
@@ -337,7 +337,7 @@ int ClientInterface::setup_receiver(Interface &socket) {
         int msize[2] = {arg.numberOfDetector.x, arg.numberOfDetector.y};
         impl()->setDetectorSize(msize);
     }
-    impl()->setModulePositionId(arg.moduleId);
+    impl()->setModulePositionId(arg.moduleIndex);
     impl()->setDetectorHostname(arg.hostname);
 
     // udp setup
diff --git a/slsSupportLib/include/sls/ToString.h b/slsSupportLib/include/sls/ToString.h
index bd102e2b2..bbcd4a6c9 100644
--- a/slsSupportLib/include/sls/ToString.h
+++ b/slsSupportLib/include/sls/ToString.h
@@ -55,9 +55,6 @@ std::ostream &operator<<(std::ostream &os,
 std::string ToString(const slsDetectorDefs::currentSrcParameters &r);
 std::ostream &operator<<(std::ostream &os,
                          const slsDetectorDefs::currentSrcParameters &r);
-std::string ToString(const slsDetectorDefs::udpDestination &r);
-std::ostream &operator<<(std::ostream &os,
-                         const slsDetectorDefs::udpDestination &r);
 const std::string &ToString(const std::string &s);
 
 /** Convert std::chrono::duration with specified output unit */
diff --git a/slsSupportLib/include/sls/network_utils.h b/slsSupportLib/include/sls/network_utils.h
index b741b6e5e..68b090651 100644
--- a/slsSupportLib/include/sls/network_utils.h
+++ b/slsSupportLib/include/sls/network_utils.h
@@ -30,7 +30,7 @@ class IpAddr {
         return addr_ != other;
     }
     constexpr uint32_t uint32() const noexcept { return addr_; }
-};
+} __attribute__((packed));
 
 class MacAddr {
   private:
@@ -57,13 +57,33 @@ class MacAddr {
         return addr_ != other;
     }
     constexpr uint64_t uint64() const noexcept { return addr_; }
-};
+} __attribute__((packed));
+
+struct UdpDestination {
+    uint32_t entry{};
+    uint32_t port{};
+    uint32_t port2{};
+    IpAddr ip;
+    IpAddr ip2;
+    MacAddr mac;
+    MacAddr mac2;
+    std::string str() const;
+
+    constexpr bool operator==(const UdpDestination &other) const {
+        return ((entry == other.entry) && (port == other.port) &&
+                (port2 == other.port2) && (ip== other.ip) &&
+                (ip2 == other.ip2) && (mac == other.mac) &&
+                (mac2 == other.mac2));
+    }
+} __attribute__((packed));
+
+std::ostream &operator<<(std::ostream &out, const IpAddr &addr);
+std::ostream &operator<<(std::ostream &out, const MacAddr &addr);
+std::ostream &operator<<(std::ostream &out, const UdpDestination &dest);
 
 IpAddr HostnameToIp(const char *hostname);
 std::string IpToInterfaceName(const std::string &ip);
 MacAddr InterfaceNameToMac(const std::string &inf);
 IpAddr InterfaceNameToIp(const std::string &ifn);
-std::ostream &operator<<(std::ostream &out, const IpAddr &addr);
-std::ostream &operator<<(std::ostream &out, const MacAddr &addr);
 
 } // namespace sls
diff --git a/slsSupportLib/include/sls/sls_detector_defs.h b/slsSupportLib/include/sls/sls_detector_defs.h
index 0311ee816..85d10288f 100644
--- a/slsSupportLib/include/sls/sls_detector_defs.h
+++ b/slsSupportLib/include/sls/sls_detector_defs.h
@@ -494,35 +494,13 @@ typedef struct {
         }
     } __attribute__((packed));
 
-    struct udpDestination {
-        uint32_t entry_{};
-        uint32_t port_{};
-        uint32_t port2_{};
-        uint32_t ip_{};
-        uint32_t ip2_{};
-        uint64_t mac_{};
-        uint64_t mac2_{};
-        udpDestination() {}        
-        udpDestination(uint32_t entry, uint32_t port = 0, uint32_t ip = 0, uint64_t mac = 0,
-                       uint32_t port2 = 0, uint32_t ip2 = 0, uint64_t mac2 = 0)
-            : entry_(entry), port_(port), port2_(port2), ip_(ip), ip2_(ip2),
-              mac_(mac), mac2_(mac2) {}
-
-        bool operator==(const udpDestination &other) const {
-            return ((entry_ == other.entry_) && (port_ == other.port_) &&
-                    (port2_ == other.port2_) && (ip_ == other.ip_) &&
-                    (ip2_ == other.ip2_) && (mac_ == other.mac_) &&
-                    (mac2_ == other.mac2_));
-        }
-    } __attribute__((packed));
-
     /**
      * structure to udpate receiver
      */
     struct rxParameters {
         detectorType detType{GENERIC};
         xy numberOfDetector;
-        int moduleId{0};
+        int moduleIndex{0};
         char hostname[MAX_STR_LENGTH];
         int udpInterfaces{1};
         int udp_dstport{0};
diff --git a/slsSupportLib/include/sls/sls_detector_funcs.h b/slsSupportLib/include/sls/sls_detector_funcs.h
index 0c0403aca..4a4fd8f61 100755
--- a/slsSupportLib/include/sls/sls_detector_funcs.h
+++ b/slsSupportLib/include/sls/sls_detector_funcs.h
@@ -244,7 +244,6 @@ enum detFuncs {
     F_SET_DBIT_PIPELINE,
     F_GET_DBIT_PIPELINE,
     F_GET_MODULE_ID,
-    F_SET_MODULE_ID,
     F_GET_DEST_UDP_LIST,
     F_SET_DEST_UDP_LIST,
     F_GET_NUM_DEST_UDP,
@@ -602,7 +601,6 @@ const char* getFunctionNameFromEnum(enum detFuncs func) {
     case F_SET_DBIT_PIPELINE:               return "F_SET_DBIT_PIPELINE";
     case F_GET_DBIT_PIPELINE:               return "F_GET_DBIT_PIPELINE";
     case F_GET_MODULE_ID:                   return "F_GET_MODULE_ID";
-    case F_SET_MODULE_ID:                   return "F_SET_MODULE_ID";
     case F_GET_DEST_UDP_LIST:               return "F_GET_DEST_UDP_LIST";
     case F_SET_DEST_UDP_LIST:               return "F_SET_DEST_UDP_LIST";
     case F_GET_NUM_DEST_UDP:                return "F_GET_NUM_DEST_UDP";
diff --git a/slsSupportLib/include/sls/versionAPI.h b/slsSupportLib/include/sls/versionAPI.h
index 1ffaac211..f2ca9f43a 100644
--- a/slsSupportLib/include/sls/versionAPI.h
+++ b/slsSupportLib/include/sls/versionAPI.h
@@ -1,15 +1,13 @@
 /** API versions */
 #define GITBRANCH    "roundrobin"
-
-
-
 #define APILIB 0x210831
 #define APIRECEIVER 0x210831
 #define APIGUI 0x210819
-#define APICTB 0x210908
-#define APIGOTTHARD 0x210908
-#define APIGOTTHARD2 0x210908
-#define APIJUNGFRAU 0x210908
-#define APIMYTHEN3 0x210908
-#define APIMOENCH 0x210907
-#define APIEIGER 0x210908
+
+#define APICTB 0x210909
+#define APIGOTTHARD 0x210909
+#define APIGOTTHARD2 0x210909
+#define APIJUNGFRAU 0x210909
+#define APIMYTHEN3 0x210909
+#define APIMOENCH 0x210909
+#define APIEIGER 0x210909
diff --git a/slsSupportLib/src/ToString.cpp b/slsSupportLib/src/ToString.cpp
index e37ef0d73..8e7bd69cd 100644
--- a/slsSupportLib/src/ToString.cpp
+++ b/slsSupportLib/src/ToString.cpp
@@ -28,7 +28,7 @@ std::string ToString(const slsDetectorDefs::rxParameters &r) {
     oss << '[' << "detType:" << r.detType << std::endl
         << "numberOfDetector.x:" << r.numberOfDetector.x << std::endl
         << "numberOfDetector.y:" << r.numberOfDetector.y << std::endl
-        << "moduleId:" << r.moduleId << std::endl
+        << "moduleIndex:" << r.moduleIndex << std::endl
         << "hostname:" << r.hostname << std::endl
         << "udpInterfaces:" << r.udpInterfaces << std::endl
         << "udp_dstport:" << r.udp_dstport << std::endl
@@ -148,31 +148,6 @@ std::ostream &operator<<(std::ostream &os,
     return os << ToString(r);
 }
 
-std::string ToString(const slsDetectorDefs::udpDestination &r) {
-    std::ostringstream oss;
-    oss << '[' << std::endl
-        << "entry " << r.entry_ << std::endl
-        << "ip " << IpAddr(r.ip_) << std::endl
-        << "mac " << MacAddr(r.mac_) << std::endl
-        << "port " << r.port_ << std::endl;
-    if (r.port2_ != 0) {
-        oss << "port2 " << r.port2_ << std::endl;
-    }
-    if (r.ip2_ != 0) {
-        oss << "ip2 " << IpAddr(r.ip2_) << std::endl;
-    }
-    if (r.mac2_ != 0) {
-        oss << "mac2 " << MacAddr(r.mac2_) << std::endl;
-    }
-    oss << ']';
-    return oss.str();
-}
-
-std::ostream &operator<<(std::ostream &os,
-                         const slsDetectorDefs::udpDestination &r) {
-    return os << ToString(r);
-}
-
 std::string ToString(const defs::runStatus s) {
     switch (s) {
     case defs::ERROR:
diff --git a/slsSupportLib/src/network_utils.cpp b/slsSupportLib/src/network_utils.cpp
index 2f05e948c..56507e8f1 100644
--- a/slsSupportLib/src/network_utils.cpp
+++ b/slsSupportLib/src/network_utils.cpp
@@ -69,6 +69,26 @@ std::string MacAddr::str() const { return to_hex(':'); }
 
 std::string MacAddr::hex() const { return to_hex(); }
 
+std::string UdpDestination::str() const {
+    std::ostringstream oss;
+    oss << '[' << std::endl
+        << "entry " << entry << std::endl
+        << "ip " << ip << std::endl
+        << "mac " << mac << std::endl
+        << "port " << port << std::endl;
+    if (port2 != 0) {
+        oss << "port2 " << port2 << std::endl;
+    }
+    if (ip2 != 0) {
+        oss << "ip2 " << ip2 << std::endl;
+    }
+    if (mac2 != 0) {
+        oss << "mac2 " << mac2 << std::endl;
+    }
+    oss << ']';
+    return oss.str();
+}
+
 std::ostream &operator<<(std::ostream &out, const IpAddr &addr) {
     return out << addr.str();
 }
@@ -77,6 +97,10 @@ std::ostream &operator<<(std::ostream &out, const MacAddr &addr) {
     return out << addr.str();
 }
 
+std::ostream &operator<<(std::ostream &out, const UdpDestination &dest) {
+    return out << dest.str();
+}
+
 IpAddr HostnameToIp(const char *hostname) {
     addrinfo hints;
     addrinfo *result = nullptr;
diff --git a/slsSupportLib/tests/test-file_utils.cpp b/slsSupportLib/tests/test-file_utils.cpp
index 254c52055..b4f71cfb9 100644
--- a/slsSupportLib/tests/test-file_utils.cpp
+++ b/slsSupportLib/tests/test-file_utils.cpp
@@ -9,7 +9,7 @@ TEST_CASE("Get size of empty file") {
     char fname[] = "temfile_XXXXXX";
     std::ifstream ifs(fname);
     auto size = sls::getFileSize(ifs);
-    REQUIRE(size == 0);
+    REQUIRE(size <= 0); // -1 or zero
 }
 
 TEST_CASE("Get size of file with data") {
diff --git a/slsSupportLib/tests/test-network_utils.cpp b/slsSupportLib/tests/test-network_utils.cpp
index 295da4c10..a6464d2b4 100644
--- a/slsSupportLib/tests/test-network_utils.cpp
+++ b/slsSupportLib/tests/test-network_utils.cpp
@@ -112,4 +112,19 @@ TEST_CASE("Copy construct a MacAddr") {
     CHECK(addr == addr2);
 }
 
+
+TEST_CASE("udp dst struct basic properties"){
+    static_assert(sizeof(UdpDestination) == 36);
+    UdpDestination dst{};
+    REQUIRE(dst.entry == 0); 
+    REQUIRE(dst.port == 0); 
+    REQUIRE(dst.port2 == 0); 
+    REQUIRE(dst.ip == 0); 
+    REQUIRE(dst.ip2 == 0); 
+    REQUIRE(dst.mac == 0); 
+    REQUIRE(dst.mac2 == 0); 
+
+}
+
+
 // TODO!(Erik) Look up a real hostname and verify the IP