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

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

Thomas Li Fredriksen — Wed, 09 Jan 2019 12:46:24 GMT

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

Thank you for your help

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

Thomas Li Fredriksen — Wed, 09 Jan 2019 11:41:27 GMT

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

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

Håkon Alseth — Tue, 08 Jan 2019 12:15:57 GMT

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