return error code BLE_ERROR_NO_TX_BUFFERS from sd_ble_gattc_write()

RE: return error code BLE_ERROR_NO_TX_BUFFERS from sd_ble_gattc_write()

Anders Strand — Tue, 01 Dec 2015 10:19:10 GMT

You can look at the BLE data throughput section of the S120 softdevice specification. This table lists the throughput in kbps. To find the packets/interval, use the following formula:

N = ( throughput (kbps) * interval(s) ) / (20 * 8)

20: 20 bytes/packets
8: 8 bits/byte

See this thread on BLE throughput

RE: return error code BLE_ERROR_NO_TX_BUFFERS from sd_ble_gattc_write()

leibin — Tue, 01 Dec 2015 02:12:07 GMT

Thanks for the reply! BTW, Is there any document which I can refer to about this?

RE: return error code BLE_ERROR_NO_TX_BUFFERS from sd_ble_gattc_write()

Anders Strand — Mon, 30 Nov 2015 10:33:35 GMT

Hi.

You have a certain amount of buffers for each connection. In S120, you have room for 1 packet in the output buffer for each connection.

You can write to a different connection after getting this error from another.