Troubleshooting Unresponsive cellular component in Bypass mode
Digi XBee3 Cellular LTE-M/NB-IoT Global Smart Modem User Guide
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Unresponsive cellular component in Bypass mode
When in Bypass mode, the XBee Smart Modem does not automatically reset or reboot the cellular
component if it becomes unresponsive.
Condition
In Bypass mode, the XBee Smart Modem does not respond to commands.
Solution
1. Query the AI (Association Indication) parameter to determine whether the cellular component
is connected to the XBee Smart Modem software. If AIis 0x2F, Bypass mode should work. If
not, look at the status codes in AI (Association Indication) for guidance.
2. Ensure that you set DO (Device Options) bit 3 to 0 before entering Bypass mode.
3. You can send the !R (Modem Reset) command to reset only the cellular component.
Syntax error at line 1
You may get a syntax error at line 1 error after pasting example MicroPython code and pressing
Ctrl+D.
Solution
This commonly happens when you accidentally type a character at the beginning of line 1 before
pasting the code.
Error Failed to send SMS
In MicroPython, you consistently get Error Failed to send SMS messages.
Note For NB-IoT, SMSsupport is dependent on the network. Contact your network provider for
details.
Solution
Your device cannot connect to the cell network. The reason may be:
1. The antenna is improperly or loosely connected.
2. The device is at a location where cellular service cannot reach. If the device is connected to the
network, the red LED blinks about twice in a second. If it is not connected it does not blink; see
Associate LED functionality.
3. You SIMcard is out of SMS text quota.
4. The device is not getting enough current, for example if power is being supplied only by USB to
the XBIB development board, rather than using an additional external power supply.
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