How can I change the TX_BUFFERS on both nrf51 and nrf52?

[bluetoothbiao]

HI, I get the information frome the sd_ble_tx_buffer_count_get that ,the nrf51 with S110 SD8.0 has 7 count(7*32BYTES) of TX_buffers (I can use 6cnt one time) . The nrf52 with SDK 0.9.2 SDs132_nrf52_2.0.0-4.alpha_softdevice has 3 TX_buffers(2 count can i used).

I want to know that

1. How can I change the tx_buffers size ,or how can I keep the txbuffers always have some data in there?    I have tested the BLE_EVT_TX_COMPLETE event to send data as fast as I can ,that is not fast enough.

[Petter Myhre]

Currently the tx buffer size is fixed, but soon you will be able to set the size when you enable the SoftDevice.

As a peripheral and server, the maximum throughput you can achieve is 42.6 kbps, by using notifications. This is with 20 bytes in each packet, 2 packets per connection interval, and 7.5 ms connection interval. This is only achieveable if the central device supports 7.5 ms connection interval and 2 packets per connection interval.

You achieve the maximum throughput by calling sd_ble_gatts_hvx() in a loop until it returns BLE_ERROR_NO_TX_BUFFERS. And restart this loop every time you get BLE_EVT_TX_COMPLETE.

[Eric Smith]

Regarding configuring the number of tx buffers, has "soon" arrived yet (e.g., as of SDK 14.2, S132 v5.1)? What is needed to configure that?

Is it possible to send more than 2 packets per connection interval? I've done this in the past with a competing BLE solution, so I hope that the nRF52 can do it.