The multiwii_python from andreiciubotariu

exceptions

I added a couple of prints so i could try and figure out what it's doing. and i'm getting exceptions. I'm new to the MSP protocol and i'm working with 2.1 of inav which apparently uses the v2 version of MSP.

I'm trying to get GPS data from the FC that's all i'm really interested in. So right now the main looks like the following:

i'm assuming the "container" section is the reply from the FC to the IDENT? When I tried the program unmodified, i got the exception in the second code section (under the dashes).

Any help would be appreciated in getting at the GPS data

if __name__ == '__main__':
    transport = Serial(port='/dev/ttyACM0',
                       baudrate=115200,
                       timeout=5)
    msp = MSP(transport, initialization_delay=15)

    stop_gps_updates(msp)

    print("Getting IDENT")
    print(msp.request(MSP_IDENT))


    counter = 0
    print("Getting RAW_GPS")
    while True:
         print(counter)
         print(msp.receive_data(msp.get_response(MSP_RAW_GPS)))
         print(msp.request(MSP_ALTITUDE))
         counter += 1
         time.sleep(1)

Waiting 15 seconds for board to wake up
Done waiting
Sending MSP len 10
Getting IDENT
Sending MSP len 6
Container:
    preamble = b'$M' (total 2)
    direction = b'>' (total 1)
    size = 7
    message_id = 100
    version = 231
    multitype = 3
    msp_version = 0
    capability = 2147483708
    crc = 59
Getting RAW_GPS
0
Attempted to parse b''
Traceback (most recent call last):
  File "msp.py", line 327, in <module>
    print(msp.receive_data(msp.get_response(MSP_RAW_GPS)))
  File "msp.py", line 293, in receive_data
    return self.parse(received_data, parser)
  File "msp.py", line 275, in parse
    parsed_data = template.parse(data)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 304, in parse
    return self.parse_stream(io.BytesIO(data), **contextkw)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 316, in parse_stream
    return self._parsereport(stream, context, "(parsing)")
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 328, in _parsereport
    obj = self._parse(stream, context, path)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 1979, in _parse
    subobj = sc._parsereport(stream, context, path)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 328, in _parsereport
    obj = self._parse(stream, context, path)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 2468, in _parse
    return self.subcon._parsereport(stream, context, path)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 328, in _parsereport
    obj = self._parse(stream, context, path)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 2538, in _parse
    obj = self.subcon._parsereport(stream, context, path)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 328, in _parsereport
    obj = self._parse(stream, context, path)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 856, in _parse
    return stream_read(stream, length)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 86, in stream_read
    raise StreamError("stream read less then specified amount, expected %d, found %d" % (length, len(data)))
construct.core.StreamError: stream read less then specified amount, expected 2, found 0

charlesb@GroundStation:~/src/msp/multiwii_python$ python3 msp.py
Waiting 15 seconds for board to wake up
Done waiting
Sending MSP len 10
Sending MSP len 6
Container:
    preamble = b'$M' (total 2)
    direction = b'>' (total 1)
    size = 7
    message_id = 100
    version = 231
    multitype = 3
    msp_version = 0
    capability = 2147483708
    crc = 59
0
Drop flotation device (timed)
Sending MSP len 7
Attempted to parse b'$M>H4\x00'
Traceback (most recent call last):
  File "msp.py", line 364, in <module>
    msp.read_ack(MSP_SET_RC_OVERRIDES)
  File "msp.py", line 251, in read_ack
    ack = self.receive_data(MSP_ACK)
  File "msp.py", line 293, in receive_data
    return self.parse(received_data, parser)
  File "msp.py", line 275, in parse
    parsed_data = template.parse(data)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 304, in parse
    return self.parse_stream(io.BytesIO(data), **contextkw)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 316, in parse_stream
    return self._parsereport(stream, context, "(parsing)")
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 328, in _parsereport
    obj = self._parse(stream, context, path)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 1979, in _parse
    subobj = sc._parsereport(stream, context, path)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 328, in _parsereport
    obj = self._parse(stream, context, path)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 2468, in _parse
    return self.subcon._parsereport(stream, context, path)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 328, in _parsereport
    obj = self._parse(stream, context, path)
  File "/home/charlesb/.local/lib/python3.6/site-packages/construct/core.py", line 2540, in _parse
    raise ConstError("parsing expected %r but parsed %r" % (self.value, obj))
construct.core.ConstError: parsing expected 0 but parsed 72

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