Nexus 5 GATT 133 Only in SDK 8.1 and SDK 9.0

[Lucas]

Hello,

I am building a custom app and upon moving to SDK 8.1... and later SDK 9.0 I experience very odd behavior with Nexus 5 specifically. Our custom application works well in SDK 9.0 on MCP dongle and Iphone 5/6 and Nexus 4. However, nexus 5 receives GATT 133 and has trouble connecting to peripheral most of the time. Sometimes it cannot but it cant send or receive data.

The change log in SDK 8.1 and SDK 9.0 make it seem like nothing changed in the way of BLE. Also, the HRM project in SDK 9.0 and SDK 8.1 seems to work fine. I ported the BLE initialization out of that project and into mine and I was able to get a more reliable connection, but still having trouble sending and receiving data.

It is a very odd bug and very specific to one phone. What changed in the way of BLE in the SDK 8.1? THat is where problem started??????

[Petter Myhre]

I'm not sure what could cause this, but a sniffer trace would definitively help. Then we can see what is different on the air. You can use the nRF Sniffer.