XBee 3 LTE-M/NB-IoT: MAIN.PY wont respond to SMS when in AP=0 Transparent Mode

XBee & XBee Gateway XBee - Cellular
1

XBee 3 LTE-M/NB-IoT cellular module.
Using XBee Studio and the Xbee TH Dev Kit board.

PS=1 MicroPython Auto-Start enabled

Main.py executes fine when in AP=4 MicroPython REPL mode.
The module responds correctly to a “reset” SMS.

It fails to respond to a “reset” SMS when in AP=0 Transparent mode.
The short heartbeat LED flash continues, so I know the code is still running.
Suggestions?

main.py

import xbee
import network
import utime
import machine

led = machine.Pin(“D9”, machine.Pin.OUT)
c = network.Cellular()
while True:
    led.value(0)
    utime.sleep(0.1)      # heartbeat flash
    led.value(1)
    msg = c.sms_receive()
    if msg:
        if msg[‘message’] == “reboot”:
            c.shutdown(reset=True)
            utime.sleep(30)
        if msg[‘message’] == “reset”:
            xbee.atcmd(“NR”)
            led.value(0)
            utime.sleep(0.5)
            led.value(1)
            utime.sleep(0.5)
            led.value(0)
            utime.sleep(0.5)
            led.value(1)
    utime.sleep(10)
2

Is the PS command set to 1?

3

Yes

PS=1 MicroPython Auto-Start enabled

4

If you set this back to AP4, does it work again? If so, who is the carrier?

5

Yes, I can flip it back and forth AP=0 (fails) and AP=4 (works).

T-Mobile set to LTE-M only
Soarcomm SIM

6

Any suggeestion to get this to work?

7

How are you determining that the application is not running when AP is set to 0?

8

The short heartbeat LED flash continues, so I know the code is still running.

    led.value(0)
    utime.sleep(0.1)      # heartbeat flash
    led.value(1)
9

If part of the code is working, then all of it would be.