feat: read fw version from device

read-settings.py

@@ -0,0 +1,70 @@
+#!/usr/bin/env python3
+
+from binascii import crc_hqx
+from itertools import cycle
+from sys import argv
+from time import time
+
+from serial import Serial
+
+KEY = bytes.fromhex('166c14e62e910d402135d5401303e980')
+PREAMBLE = b'\xab\xcd'
+POSTAMBLE = b'\xdc\xba'
+
+CMD_VERSION_REQ = 0x0514
+
+CMD_VERSION_RES = 0x0515
+
+def crc16(data):
+    return crc_hqx(data, 0).to_bytes(2,'little')
+
+
+def len16(data):
+    return int.to_bytes(len(data), 2, byteorder='little')
+
+
+def xor(var):
+    return bytes(a ^ b for a, b in zip(var, cycle(KEY)))
+    
+
+def timestamp32():
+    return int(time()).to_bytes(4, 'little')
+
+
+def cmd16(cmd_id):
+    return cmd_id.to_bytes(2,'little')
+
+
+def cmd_req(cmd_id, body=b''):
+    data = body + timestamp32()
+    payload = cmd16(cmd_id) + len16(data) + data
+    encoded_payload = xor(payload + crc16(payload))
+
+    return PREAMBLE + len16(payload) + encoded_payload + POSTAMBLE
+
+
+def cmd_resp(cmd_id, data):
+    if cmd_id == CMD_VERSION_RES:
+        print(data[:10].decode())
+
+
+def main(port):
+    cmd = cmd_req(CMD_VERSION_REQ)
+    with Serial(port, 38400, timeout=5) as s:
+        s.write(cmd)
+        preamble = s.read(2)
+
+        if preamble != PREAMBLE:
+            print('Bad response')
+            exit(128)
+
+        payload_len = int.from_bytes(s.read(2), 'little')
+        data = xor(s.read(payload_len))
+        # print(data.hex())
+        cmd_id = int.from_bytes(data[:2], 'little')
+        data_len = int.from_bytes(data[2:4], 'little')
+        cmd_resp(cmd_id, data[4:4+data_len])
+        
+
+if __name__ == '__main__':
+    main(argv[1])

requirements.txt

@@ -0,0 +1 @@
+pyserial