nRF52832 connection problem with some android device

RE: nRF52832 connection problem with some android device

Hung Bui — Thu, 20 Jul 2017 07:50:55 GMT

Hi Youngjun,

gatt_init() is a new function we included in SDK v13 to enable Bluetooth 4.2 features (long MTU). Some phone doesn't support this and disconnect when receive the request. There is no problem remove gatt_init().

RE: nRF52832 connection problem with some android device

Youngjun — Thu, 20 Jul 2017 00:57:35 GMT

When i comment gatt_init() in main, LG V20 android device can discover service. Sometimes, I got Error 133 and disconnected. But, gallaxy tap A 10.1 was same as above problem. Is there any problem commenting gatt_init() function?

RE: nRF52832 connection problem with some android device

Hung Bui — Wed, 19 Jul 2017 07:55:01 GMT

Are you sure it's reason 42 = 0x2A = BLE_HCI_DIFFERENT_TRANSACTION_COLLISION ? It's a pretty strange disconnection reason, I haven't seen it before. Maybe you want to add a break point in BLE_GAP_EVT_DISCONNECTED event and check ?

You also may want to have a look at this case and this similar case.

Not sure if it's the same issue, if you can capture a sniffer trace, it would be clearer.

RE: nRF52832 connection problem with some android device

Youngjun — Wed, 19 Jul 2017 03:03:30 GMT

I checked that the brakepoint is working at BLE_GAP_EVT_CONNETED and BLE_GAP_EVT_DISCONNECTED. And, nRF52 connected with V20 in nRF52 debugging mode. But, a few seconds after, nRF52 disconnected automatically. the log was "Disconnected, reason 42". Thanks.Thanks, Regards Youngjun.

RE: nRF52832 connection problem with some android device

Hung Bui — Mon, 17 Jul 2017 10:24:01 GMT

It would be useful to have a sniffer trace to see what happens over the air.

Could you check if there is any assertion on the nRF52?

Could you check in on_ble_evt() if the BLE_GAP_EVT_CONNECTED event occurred ? and then BLE_GAP_EVT_DISCONNECTED event happens after that ? If there is BLE_GAP_EVT_DISCONNECTED, which disconnected reason (check the p_ble_evt) ?

RE: nRF52832 connection problem with some android device

Youngjun — Fri, 14 Jul 2017 00:28:47 GMT

Hi Hung Bui. Thank you for your reply. I received error message when i pressed connect button. My log is like below.

Connected to FF:51:1C:9B:90:68
Error 8 (0x8): GATT CONN TIMEOUT
Disconnected 　 I use ble_app_hrs example and sdk13.0.0 s132.

Thanks, Regards Youngjun.

RE: nRF52832 connection problem with some android device

Hung Bui — Thu, 13 Jul 2017 13:24:39 GMT

Hi Yongjun,

When you receive "Error (0x8) GATT CONN TIMEOUT" it's right after you clicked "Connect" button ? Meaning the connection actually wasn't established ? Or that error arrived after you connect for a while ?

Which firmware did you use ? Could you try with ble_app_hrs for example ?