implement initial checks

slsDetectorServers/slsDetectorServer_cpp/include/DetectorServer.h

@@ -479,10 +479,17 @@ ProcessedResult DetectorServer<DerivedDetectorServer>::get_run_status(
 template <typename DerivedDetectorServer>
 ProcessedResult DetectorServer<DerivedDetectorServer>::initial_checks(
     ServerInterface &socket) const {
-    bool initial_checks_passed = getDerivedImpl()->initial_checks();
+    auto detectorsetupstatus = getDerivedImpl()->initial_checks();
 
-    return ProcessedResult{
-        static_cast<ReturnCode>(socket.sendResult(initial_checks_passed))};
+    const bool setup_successful = detectorsetupstatus.successful_setup;
+
+    if (!setup_successful) {
+        return return_fail("Initial checks failed: " +
+                           detectorsetupstatus.error_message);
+    } else {
+        return ProcessedResult{
+            static_cast<ReturnCode>(socket.sendResult(setup_successful))};
+    }
 }
 
 template <typename DerivedDetectorServer>

slsDetectorServers/slsDetectorServer_cpp/include/DetectorServerImpl.hpp

@@ -16,6 +16,14 @@ struct UDPInfo {
     uint32_t dstip{};
 };
 
+/// @brief struct to store detector setup status
+struct detector_setup_status {
+    /// @brief true if setupDetector() was successful, false otherwise
+    bool successful_setup{false};
+    /// @brief error message if setupDetector() failed, empty otherwise
+    std::string error_message{};
+};
+
 /// @brief Shared memory structure for stop server to store run status
 struct acquisitionStatus {
 
@@ -61,6 +69,8 @@ class DetectorServerImpl {
 
     uint16_t get_destination_udp_port() const;
 
+    detector_setup_status initial_checks() const;
+
   protected:
     std::array<UDPInfo, 1>
         udpDetails{}; // TODO: for now only one receiver per module
@@ -78,6 +88,9 @@ class DetectorServerImpl {
     /// @param srcmac
     void updateSrcMacAddress(const uint64_t srcmac);
 
+    /// @brief true if setupDetector() was successful, false otherwise
+    detector_setup_status detectorSetupStatus{};
+
   private:
     /// @brief creates and maps shared memory
     void createSharedMemory();