read failed after minutes of running #222
Description
On Ubuntu 20.04 with Python 3.8 after continuously running and receiving data for a few minutes we get the message
read failed: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
with a traceback starting at line 444 in xbee/reader.py and going all the way down to serial/serialposix.py. The only solution appears to be to kill the process and start it again, but that's obviously non-ideal. It's not a hardware issue as XCTU reads continuously for hours with no issue.
Nothing fancy happening in my code:
def process_xbee_packet(xbee_message):
"""
Processes the xbee packet and writes it to file.
"""
well_data = {}
raw_packet = xbee_message.data
well_data['time'] = datetime.utcnow()
well_data['start_byte'] =raw_packet[0]
well_data['transmitter_id'] = raw_packet[1]
well_data['depth'] = struct.unpack('f', raw_packet[2:6])[0]
well_data['water_temperature'] = struct.unpack('f', raw_packet[6:10])[0]
well_data['air_pressure'] = struct.unpack('f', raw_packet[10:14])[0]
well_data['air_temperature'] = struct.unpack('f', raw_packet[14:18])[0]
well_data['battery'] = struct.unpack('H', raw_packet[18:20])[0]
well_data['end_byte'] = raw_packet[20]
print(well_data['transmitter_id'])
# Write it to file if the packet is complete (start and end bytes are correct)
if (well_data['start_byte'] == 190) and (well_data['end_byte'] == 239):
write_well_data(config, well_data)
if __name__ == '__main__':
try:
device = XBeeDevice(config['XBEE']['ComPort'], config['XBEE']['BaudRate'])
device.open()
device.add_data_received_callback(process_xbee_packet)
input()
except (KeyboardInterrupt, SystemExit):
device.close()