two NRF51822 communication fails sometimes

RE: two NRF51822 communication fails sometimes

run_ar — Wed, 23 Aug 2017 08:42:11 GMT

@ephobbyiest Can you verify if the central receives the advertisement packets from the nRF51 Peripheral? What is the RSSI? Is this a Nordic nRF51 DK or custom HW?

RE: two NRF51822 communication fails sometimes

endnode — Mon, 21 Aug 2017 20:40:03 GMT

I suggest to get some BLE radio traces of these unsuccessful connections to see where could be a problem. Of course having debug trace of events and SD API call from the FWs would help as well...

RE: two NRF51822 communication fails sometimes

phob — Mon, 21 Aug 2017 16:46:28 GMT

I am using same SDK for both nrf51 and nrf52 board. I didn't change any parameter from example which were available in SDK.

RE: two NRF51822 communication fails sometimes

run_ar — Thu, 03 Aug 2017 20:06:12 GMT

@phob are you using the same sdk for both the nRF51 and nRF52 peripheral? Are they using the same advertisement parameters (interval and timeout) and adv data? did you use an sdk example or a custom application?

RE: two NRF51822 communication fails sometimes

endnode — Wed, 02 Aug 2017 19:45:00 GMT

Still your description sounds like "my car stopped working please fix it" without saying where you are, what car you have, what is on the panel, what you observed before it stopped and all that to complete stranger over the phone who is thousands miles away. What I want to say is: there can be hundreds of reasons and without precise description what HW board (not just which chip), what FW (not just SDK version) and what use case (= exactly what packets were exchanged over the air or at least some verbose debug trace from the FWs) I cannot help you (and I'm afraid neither do Nordic support team or the rest of the forum).

E.g. if there is no connection is your nRF51 Peripheral advertising? Then you start speaking about pairing but how that could happen if there is no connection link? Really confusing.

RE: two NRF51822 communication fails sometimes

phob — Wed, 02 Aug 2017 18:01:11 GMT

I am using SDK v12.2.0. I think in the case i mentioned, Central device(NRF51822) is working fine. But when i use second NRF51822 for peripheral then communication is not happening. Not getting connect to central. But When i use NRF52 as peripheral with same code then It works. But i have to use NRF51822 only. Communication fails means they are not at all getting connect. not pairing as well. I have don't have sniffer to capture the log.

RE: two NRF51822 communication fails sometimes

endnode — Wed, 02 Aug 2017 15:05:45 GMT

Sorry but it's hard to say without knowing what exactly you are running on these boards (FW) and what do you mean by "communication fails": in what phase? Can you do radio log with BLE sniffer to see which peer causes the hang? Do you have any debug logs from FWs running on these boards?