create tc-messenger script

api/src/opentrons/hardware_control/modules/tc_messenger.py

@@ -0,0 +1,41 @@
+import sys
+from serial import Serial
+
+_READ_ALL = "readall"
+_READ_LINE = "read"
+_LID_AND_SEAL_STATUS = "status"
+_MOVE_SEAL = "ms"
+_DONE = "done"
+
+
+def comms_loop(dev):
+    exit = False
+    command = input("enter a command\n")
+    if command == _READ_ALL:
+        print(dev.readlines())
+    elif command == _READ_LINE:
+        print(dev.readline())
+    elif command == _LID_AND_SEAL_STATUS:
+        dev.write("M119\n".encode())
+        print(dev.readline())
+    elif command == _MOVE_SEAL:
+        distance = input("enter distance in steps")
+        dev.write(f"M241.D {distance}\n")
+        print(dev.readline())
+    elif command == _DONE:
+        exit = True
+    else:
+        dev.write(f"{command}\n")
+        print(dev.readline())
+
+    return exit
+
+
+def _main():
+    dev = Serial('/dev/ot_module_thermocycler0', 9600, timeout=2)
+    run = True
+    while run:
+        run = comms_loop(dev)
+
+if __name__ == '__main__':
+    sys.exit(_main())