How to transmit 6 packets in S130 Uart central

[mc]

Hi there,

I am struct for two days trying to send 6 packets of 20 bytes as central. I use ble app uart central sample from nrf5_sdk11.0 with nrf51 S130 v2.0 softdevice.

I start believing that this sample and softdevice can only transmit 3 packets per connection interval. As I debug in the central side, it can only execute write command with out response 3 times then a buffer full occurs. When I get the sd_ble_tx_packet_count_get during connection it is only 3. I expect that is 6...for 6 tx? I also monitor the write event in the peripheral side I can only get 3 write interrupt.

I try to use the sd_ble_opt_set(BLE_COMMON_OPT_CONN_BW, &ble_opt) setting the tx and rx bandwidth to BLE_CONN_BW_HIGH but won't work out. I use this API during stack initialization and also right after sd_ble_gap_connect. It seems it only accept BLE_CONN_BW_MID

What would be my configuration to make to transmit 6 packets per connection interval. My connection interval is only 100msec and using S310 version 3.0 in the peripheral side.

Thank you for helping me out. -Mc

[RK]

Are you actually configuring the BLE stack when you initialise it to have available high bandwidth central connections? the sd_ble_opt_set() is used to tell the softdevice on a per-connection basis which of the configured bandwidths to use, but if you haven't allocated any high-bandwidth central connections when you enabled the softdevice in the first place, there aren't any available.

Post the code you're using to set up the parameters for sd_ble_enable(), that's where you have to initially configure the SD to have the connections you want.

[Jorge]

Hello, I'm trying also to change to the Bandwidth high on the ble_app_uart_c, but I can't change it, I already had a look at the release notes, examples, and some codes here on the Devzone but can't manage to make my project work... If you can show me how did you manage to do it on the S130 v2.0 I would be appreciated. Regards, Jorge