Mostly working, may need to improve handling of sporadic extra null byte

Makefile

@@ -0,0 +1,12 @@
+include /ioc/tools/driver.makefile
+
+MODULE=epluse
+
+BUILDCLASSES=Linux
+EPICS_VERSIONS=7.0.7
+ARCH_FILTER=RHEL%
+
+TEMPLATES += epluse.db
+TEMPLATES += epluse.proto
+
+SCRIPTS += epluse.cmd

README.md

@@ -0,0 +1,7 @@
+## EPICS support for EplusE environmental sensors
+
+Basic support EplusE environmental sensors, right now only reads
+temperature and relative humidity.
+
+### Protocol
+These device has a binary protocol,  which are supported through streamdevice.

db/epluse.proto

@@ -11,13 +11,16 @@ fetch_rht {
     # 4th byte length of message, 2 bytes
     # 5th and 6th byte, data. For this case it is 1
     
-    out 0x0000 0x67 0x02 0x0001 0x6a;
+    out 0x00 0x00 0x67 0x02 0x00 0x01 0x6a;
     # First 2 bytes is address
+    # 0xca8b is the unit at neutra
     # command
     # length
     # ack
-    # ack
+    # 0x00, unknown what this is
     # 2 ieee_754 floats.
     # Read exactly one char, but drop it. crc8
-    in 0x0000 0x67 0x0A 0x06 0x06 "%(\$1:TEMP)#R%(\$1:RELHUM)#R%*c" 
+    # The device sometimes adds an extra 0x00 at the end...weird
+    $ this is handled with ?c command
+    in 0xca 0x8b 0x67 0x0A 0x06 0x00 "%(\$1:TEMP)#R%(\$1:RELHUM)#R%*c%?c";  
 }

epluse.cmd

@@ -0,0 +1,12 @@
+require asyn
+require stream
+# Parameterized snippet to load support for the eplue EE31 environmental sensor used at ICON and Neutra.
+
+# cmd file needs the macros INSTR, typically capital letter name of the instrument, and
+# and MOXA_ADDR on format hostname:port.
+
+epicsEnvSet("PROTO", "$(epluse_DB)epluse.proto")
+
+drvAsynIPPortConfigure("$(INSTR)-sps", "$(MOXA_ADDR)",0,0,0)
+
+dbLoadRecords("$(epluse_DB)epluse.db", "PREFIX=SQ:$(INSTR), PORT=$(INSTR)-sps")

epluse_rht.cmd

@@ -1,7 +0,0 @@
-require asyn
-require stream
-# Parameterized snippet to load support for the eplue EE31 environmental sensor used at ICON and Neutra.
-
-drvAsynIPPortConfigure("neutra-sps", "neutra-sps:4001",0,0,0)
-
-dbLoadRecords("epluse_rht.db", "PREFIX=SQ:NEUTRA, PORT=neutra-sps")