Issue with ble data transmission to certain Android devices and influence of attached debugger

RE: Issue with ble data transmission to certain Android devices and influence of attached debugger

alpro001 — Wed, 29 Oct 2025 19:28:06 GMT

I found solution!

If i set tx power to sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_CONN, p_ble_evt->evt.gap_evt.conn_handle, 0); on BLE_GAP_EVT_CONNECTED event. And transmission started to work without any losses. Actually any tx power level except minimal -40 worked for me.

I can make assumtion that attaching of debugger increases power of transmitter in some indirect way.

RE: Issue with ble data transmission to certain Android devices and influence of attached debugger

alpro001 — Wed, 29 Oct 2025 18:17:18 GMT

devzone.nordicsemi.com/.../tab_2D00_detach_2D00_debugger.zip

My device has address: e8:48:56:9b:0c:8c , central device (tablet) - 69:9d:ad:f2:9d:40.

Transmission starts around 500 packet with debugger attached.

Debugger is detached around 10000 packet

RE: Issue with ble data transmission to certain Android devices and influence of attached debugger

Sigurd — Tue, 28 Oct 2025 15:54:53 GMT

Hi!

Could you save and upload the sniffer log here?

RE: Issue with ble data transmission to certain Android devices and influence of attached debugger

alpro001 — Mon, 27 Oct 2025 17:12:12 GMT

Hi! Not really.

I continue to explore this issue with nrf ble sniffer (based on nrf52840 dongle). As I see - disconnection of debugger leads to increase of number of packets with wrong CRC and many retransmissions

RE: Issue with ble data transmission to certain Android devices and influence of attached debugger

Sigurd — Mon, 27 Oct 2025 13:59:36 GMT

Hi!

Do you see improvements if you e.g. turn off logging? i.e. set NRF_LOG_ENABLED to 0 in sdk_config.h ?