How to find agreed packet numbers between peripheral (51822) and central?

[Li]

Hi All,

We are running some data throughput test on Samsung S3, Note2 & S4 with 51822 and have seen some interesting phenomena as describe below:

1> On both phones, the connection interval is 48.75ms (tested on 51822 side) 2> However, On S4, although the connection interval is 48.75ms, for each connection, we are able to get two packets (40 bytes). However, on S3 and Note2, we are only getting ONE packet (20 byte) per connection.

Therefore, the question is, are we able to get how many packets that are actually transmitted between peripheral and central for each connection interval on 51822 side (I know by default, packet number is 6-7, but on the central side, they don't seem to appear as that many).

Or, is there anyway to roughly calculate the transmission rate on 51822 side?

Any advice on this will be appreciated.

Cheers

L.

[Janek Mann]

You could fill the TX buffer on each BLE_EVT_TX_COMPLETE event, and keep track of how many packets you added during each connection interval.

[Li]

Thanks Janek, will try this.

[Petter Myhre]

Should work, sd_ble_tx_buffer_count_get() may also be helpful.