ble_nus_send_string BLE_ERROR_NO_TX_BUFFERS error

[qoboty]

when I call ble_nus_send_string,I got the error, error code is 0x00003003, Then I find error define like below

#define BLE_ERROR_NO_TX_BUFFERS          (NRF_ERROR_STK_BASE_NUM+0x003) /**<
Buffer capacity exceeded. */

so How I handle this error, Thank you!

[Anders Strand]

Always search before creating a new post. It is likely that others have had the same problem before :)

[Vidar Berg]

Agree with Anders here, but I can try to give you some pointers anyway. Assume you're sending a larger chunk of data received over UART? In that case the throughput of the link may not be enough to keep up with the incoming data. We do have an example on our github (link) page that handles the BLE_ERROR_NO_TX_BUFFERS by doing re-transmissions when the buffer is no longer full. Note that hardware flow control is required for this to work.

[qoboty]

Thank you, Accord to the example and the envent "BLE_EVT_TX_COMPLETE" , I can send 540 byte ssuccessfully, Thanks!

[Petter Myhre]

You can accept Vidar's answer by clicking the grey circle next to his answer.

[grzegorz]

The example is quite old now. As of SDK 15, BLE_ERROR_NO_TX_BUFFERS is renamed to NRF_ERROR_RESOURCES and BLE_EVT_TX_COMPLETE is renamed to BLE_GATTS_EVT_HVN_TX_COMPLETE.