Help with the zb-cli-wrapper python package for a ZigBee application.

[DaKa]

Hi,

I am using the BMD340 module from Rigado. The module is connected to a raspberry compute module via UART. The design implemented is the  “CLI co-processor design” where the ZigBee stack is installed and running on the SoC (https://infocenter.nordicsemi.com/index.jsp?topic=%2Fsdk_tz_v3.2.0%2Fzigbee_example_cli_agent.html). I am able to connect to the CLI and interact with it using the zb-cli-wrapper python package on python3.7.6. But for some reason when I am trying to run my application (simple application based on the example in the package) from a python virtual environment (also python3.7.6), the application hangs. I can create the ZbCliDevice object, but when I want to set channels and the role (cli_dev.bdb.channels = [16] and cli_dev.bdb.role = 'zc'), the application hangs.

I tried to debug it and found that the function that hangs is tcdrain(). This function is called by zb_cli_wrapper/src/utils/connection.py module at line 240. It tries to flush the serial buffer but hangs and I don't understand why.

Greetings,
Damien

[DaKa]

I found the issue. Our hardware is not connected to the serial flow control (RTS/CTS), and when installing the zb-cli-wrapper package, it assumes that it is connected. So I modified these attributes (self._serial.dtr = False, etc...):

class UartConnection(Connection):

    def __init__(self, port, baudrate, name=None):
        super(UartConnection, self).__init__()

        self._port = port
        self._baudrate = baudrate

        self._serial = None
        self.name = name

    def __del__(self):
        if self._serial is None:
            return

        self.close()

    def open(self):
        self._serial = serial.Serial(timeout=0, write_timeout=1.0)
        # Workaround to avoid serial communication failures
        # DTR - Data Terminal Ready
        # DSR - Data Set Ready
        # RTS - Request To Send
        # CTS - Clear To Send
        self._serial.dtr = False  # True
        self._serial.rtscts = False  # True
        self._serial.dsrdtr = False  # True
        self._serial.port = self._port
        self._serial.baudrate = self._baudrate

        self._serial.open()

BR,
Damien