Added file for 485 fuzz test

tests/test_485_fuzz.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python3
+#
+# Test: 485 fuzzer
+# ----------------
+# Repeatedly write random data to sensor via 485.
+# After that, try to read some input registers.
+# (address and baudrate is hardcoded)
+#
+# Return 0 if read was successful, 1 otherwise.
+#
+import serial
+import minimalmodbus
+
+