Zigbee RSSI value

[Marwa Sabbagh]

Hello, I'm working with nRF5340 DK with Zigbee communication. I'm getting RSSI values between 0-255, but I'm more interested in the value in dBm, so I would like to convert the value to dBm. Could you tell me how I can do that?

Best regards.

[Marte Myrvold]

Hi,

What are you using to get the RSSI value?

Best regards,

Marte

[Marwa Sabbagh]

Hi,

I am using zb_zdo_get_diag_data()

Best regards,

Marwa

[Marte Myrvold]

Hi Marwa,

I tried to use this myself, but was unable to figure out how to get RSSI as dBm. I have asked our developers for clarification regarding this, so I will come back to you when I hear from them.

Best regards,

Marte

[Marte Myrvold]

Hi Marwa,

You can use the function nrf_802154_dbm_from_energy_level_calculate() to convert energy measured in 0-255 to dBm:

zb_uint8_t lqi, rssi;
int8_t rssi_dbm;
zb_zdo_get_diag_data(0x0000, &lqi, &rssi);
rssi_dbm = nrf_802154_dbm_from_energy_level_calculate(rssi);

Best regards,

Marte

[Marwa Sabbagh]

Hello, is it accurate that as the distance between the DK increases, the more negative value in dBm it will be?

[Marte Myrvold]

Hi,

Yes, that makes sense. When talking about signal strength, the closer it is to 0, the stronger the signal is. Increasing the distance between the devices will decrease the signal strength, and you will get a more negative value. So -80 dBm will be a weaker signal than -30 dBm.

Best regards,

Marte