NRF9160 Zephyr ncs ZTE-M/NB-IOT Cell-Tower RSSI

[Thomas Li Fredriksen]

Good afternoon,

I am trying to get cell-tower information from ZTE-M/NB-IOT cell-tower information, in particular RSSI.

In addition - a constant refresh-rate, ideally above 1 Hz, would be great

/Tom

[Håkon Alseth]

Hi,

 

After you have successfully registered, you can get the reference signal received power (RSRP) via the AT command AT+CESQ:

AT+CESQ
+CESQ: 99,99,255,255,255,32
OK

The last number is the RSRP, in this case: -140 dBm + 32 = -108 dBm.

 

Here's a simple example to send AT commands:

https://github.com/Rallare/fw-nrfconnect-nrf/blob/nrf9160_samples/samples/nrf9160/simple_at/src/main.c

 

You can poll AT+CESQ in a kernel timer if you'd like a periodic update, or subscribe to notifications using AT%CESQ=1,n (see chapter 4.6 in the AT commands specification), which will give you updates on when the RSRP changes. 

 

Cheers,

Håkon

[Thomas Li Fredriksen]

Very nice.

However, do I need a specific version/patch of Zephyr to make this work? My breakpoint in `main()` does not seem to trigger, and LED1 seems to blink at constant intervals.

/Tom

[Thomas Li Fredriksen]

Nevermind, I realized that I had to forgotten to flash secure-boot.

Thank you for your help