Environment
Onomondo App: Network Logs
Device: Applicable to all devices with NB-IoT enabled
Issue
On the device
The device registers to NB-IoT network but fails to send data
On the platform
There are attach and detach data network logs
The detach data log shows 0 bytes for Download and Upload
Solution
Check if ePCO is disabled. This AT Command is often proprietary and therefore changes between modules. It is best to consult the modem manufacturer's AT command manual for the correct command.
Example - the Nordic nRF91 series:
You can use AT%XEPCO? to check the modem's current ePCO configuration.
If the response is %XEPCO: 1, then you need to change it to AT%XEPCO=0 and try to connect to the network again.