RE: 51822 connection intervals with Samsung Phones(S3, S4, note 2 on 4.3+)

Li — Mon, 08 Sep 2014 08:57:47 GMT

After some further diggings, the phenomena is clearer.

On S4, although the connection interval is 48.75ms, but in each connection, we are able to get two packets. However, on S3 and Note2, we are only getting ONE packet per connection.

Therefore, the question for now is, are we able to get how many packets are allowed to be exchanged between peripheral and central for each connection interval on 51822 side?

RE: 51822 connection intervals with Samsung Phones(S3, S4, note 2 on 4.3+)

Li — Sat, 06 Sep 2014 13:49:25 GMT

Some add ons here.

I've tried to get the connection interval after the device is connected to the central. I've tested it on two different Android ROMs. One is original samsung android 4.3 on Note 2 and another one is a 3rd party ROM on S4.

The interesting thing that I observed is both have same connection interval (39). case BLE_GAP_EVT_CONNECTED: temp_value = p_ble_evt->evt.gap_evt.params.connected.conn_params.min_conn_interval;

However, on the phone side, the data rate is totally different. S4 on 3rd party ROM almost has doubled data rate than S3 on samsuing andorid 4.3

Any thoughts?