WIP read device id test

tests/test_read_device_id.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+#
+# Test: Read device ID
+# --------------------
+# Read device ID
+#
+#
+# This functionality is not implemented in minimalmodbus,
+# so we have to emulate it (using serial)
+#
+import serial
+
+serial_file = '/dev/rs485'
+address = 247
+baudrate = 19200
+
+s = serial.Serial(serial_file, baudrate)
+
+# first test: read company ID
+msg = [
+        address,
+        0x2B, # Function code
+        0x0E, # MEI type
+        0x01, # Read device ID code (get basic identification)
+        0x14, # object ID
+        0xbc, # CRC8 MSB
+        0xda  # CRC8 LSB
+        ]
+
+msg = bytes([1,2,3,4,5,6,7,8,9,10])
+
+s.write(msg)
+response = s.read()
+print(response)