while True and serial/telnet connectivity

[cmisztur]

Should I expect to be able to telnet or connect over serial if I introduce this into my main.py script?

while True:
        machine.idle()
        try:
            mqtt_client.check_msg()
        except OSError:
            if mqtt_client.connect() != 0: utime.sleep(1)```

[robert-hh]

@cmisztur No. You get the REPL prompt only when no other script besides the REPL is running. Interrupt service routine however are served, and you can also start a thread for doing something, e.g. the code above, while you main code terminates and gets back into REPL.

[cmisztur]

@robert-hh Thank You.

mqtt_client_lock = _thread.allocate_lock()

def mqtt_check_msg_thread(client,lock):
    while True:
        try:
            #utime.sleep(1)
            with lock:
                client.check_msg()
        except OSError:
            print('MQTT failed to check_msg')
            with lock:
                if client.connect() != 0:
                    utime.sleep(1)
        except:
            print('MQTT check_msg thread failure')

def mqtt_setup():
    global mqtt_client
    global l99_serial
    is_mqtt_connected = False
    with mqtt_client_lock:
        mqtt_client = MQTTClient(l99_serial, '192.168.2.107', 1883)
        mqtt_client.set_last_will('L99/{}/io/state/offline'.format(l99_serial), '', qos=1)
        mqtt_client.set_callback(mqtt_output_command_callback)
        is_mqtt_connected = mqtt_client.connect() == 0
        if is_mqtt_connected:
            #Timer.Alarm(handler=mqtt_check_msg, ms=1000, arg=None, periodic=True)
            on_mqtt_connected(True)
        else:
            on_mqtt_connected(False)

    if is_mqtt_connected:
        _thread.start_new_thread(mqtt_check_msg_thread, (mqtt_client, mqtt_client_lock))