Setting up a bidirectional data flow between two nordic devices

RE: Setting up a bidirectional data flow between two nordic devices

Revo — Tue, 17 May 2016 13:09:51 GMT

thanks i will try and report back!

RE: Setting up a bidirectional data flow between two nordic devices

Wojtek — Tue, 17 May 2016 12:34:21 GMT

yes, right :)

RE: Setting up a bidirectional data flow between two nordic devices

Revo — Tue, 17 May 2016 12:29:54 GMT

I will search for some extra information, thanks! But basically i have to add a characteristic to my service that will "receive" the write, right?

RE: Setting up a bidirectional data flow between two nordic devices

Wojtek — Tue, 17 May 2016 12:17:55 GMT

So, you have some ADC-characteristic that sends notification, and GATTC receives it. And you want to have some communication-characteristic so GATTC will write to GATTS. You can add it to your existing custom service.

you should find somewhere example that do similar things, maybe application note nan-36 could be helpful.

RE: Setting up a bidirectional data flow between two nordic devices

Revo — Tue, 17 May 2016 12:11:57 GMT

Sorry i was wrong, in the code that i use on the DK, it actually uses sd_ble_gattc_write function to send FROM the DK to the beacon! So it is the same that you are saying. So in order to receive the values, i only have to add a characteristic in the code of the beacon? My service on the beacon has just a characteristic that is the one with the data converted by the ADC, and of course with his CCCD configured to sent the value by notification to the DK. So how should i do to get it ready to receive the "write" data from the DK?

RE: Setting up a bidirectional data flow between two nordic devices

Wojtek — Tue, 17 May 2016 11:44:53 GMT

If you want to send data to GATT server (which your beacon-peripheral probably is), you should use Write, not the Notification. Notification is used to send data from GATT server to GATT client (your DK connected to PC). I don't know how your service looks like, but i think you can just add characteristic. So, it can be used that way: GATT Client (PC connected DK) --WRITE--> your custom characteristic on GATT Server (beacon-peripheral).