docs: scaffold polisher-control foundation

host/polisher_control/protocol.py

@@ -0,0 +1,30 @@
+from enum import IntEnum
+
+
+class MessageType(IntEnum):
+    HEARTBEAT = 1
+    MANUAL_START = 2
+    SETPOINT = 3
+    MANUAL_STOP = 4
+    SEGMENT_START = 5
+    PAUSE = 6
+    RESUME = 7
+    ABORT = 8
+    ESTOP = 9
+    ACK = 100
+    NACK = 101
+    TELEMETRY = 102
+    EVENT = 103
+    SEGMENT_DONE = 104
+    ABORT_COMPLETE = 105
+
+
+class NackReason(IntEnum):
+    NONE = 0
+    BAD_CRC = 1
+    BAD_VERSION = 2
+    ILLEGAL_TRANSITION = 3
+    GEOMETRY_NOT_VALIDATED = 4
+    SAFETY_INTERLOCK_ACTIVE = 5
+    UNSUPPORTED_COMMAND = 6
+    VALUE_OUT_OF_RANGE = 7