Getting RSSI from advertising messages

Julian Guirao

Hi,

I am trying to find out whether it is possible to get RSSI value out of advertising messages sent by a Broadcaster device. I checked the code of SimpleBLECentral and SimpleBLEObserver and it doesn't seem to be possible. You are only able to start RSSI periodic reads once the connection is established (SimpleBLECentral profile only). And since a Broadcaster device doesn't accept connections, I guess there is no way to get RSSI values. Am I wrong?.

Thanks in advance.

over 13 years ago

0 kazola over 13 years ago

Guru 18625 points

Nainonainonaaaaaaaaaaaaaaa...

http://e2e.ti.com/support/low_power_rf/f/538/t/125440.aspx

And ninonainonaaaaaaaaaaaaa...

http://e2e.ti.com/support/low_power_rf/f/538/t/140189.aspx

0 Eng351 over 13 years ago in reply to kazola

Genius 4125 points

Yes it is very possible. It is also possible to extract manufacturer specific advertising data this way too:

You need to modify BLEAddDeviceInfo in GAP_DEVICE_INFO_EVENT handler of BLECentralEventCB to add it to the scan results.

The GAP_DEVICE_INFO_EVENT event gets fired every time a new device is found by the GAP scan process. The rssi value is embedded in the gapDeviceInfoEvent_t data structure that gets passed into BLECentralEventCB.

You will also need to add an RSSI field to gapDevRec_t for storage in scan results

0 Eng351 over 13 years ago in reply to Eng351

Genius 4125 points

Just a general note that the API documentation is helpful for this type of thing - have a close look at what events each procedure returns and the contents of the data structures they contain.

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Getting RSSI from advertising messages