BLE + ESB concurrent issue with no active BLE connection

RE: BLE + ESB concurrent issue with no active BLE connection

Hieu — Wed, 18 Mar 2026 14:28:53 GMT

Hi Yangz,

We only have two unofficial sample for BLE and ESB coexistence made by our colleagues.
Could you please refer to them to see what the difference might be?

too1/ncs-esb-ble-mpsl-demo - A little outdated, last updated for NCS v2.6.0

Jayant-Tang/lp-esb-rx-with-ble: Low power Enhanced ShockBurst(ESB) RX with BLE peripheral - An updated version of the above, last updated for NCS v2.9.0.

Hieu

RE: BLE + ESB concurrent issue with no active BLE connection

yangz — Tue, 17 Mar 2026 11:49:55 GMT

After I adjusted the time gap length according to your suggestion, the situation improved, but the problem was not completely resolved. Previously, the device would stop receiving data approximately 5 seconds after startup. However, after the modification, it now starts to fail to receive data approximately 1 minute after startup. Please help me. This is really important to me. Thank you very much.

RE: BLE + ESB concurrent issue with no active BLE connection

yangz — Tue, 17 Mar 2026 07:53:05 GMT

My current program is as follows: I detect the external switch for fluctuations. If the user has selected the 2.4G mode now, I will disconnect the BLE connection and turn off the broadcast. That is to say, I will not have a broadcast period. So, will this have any impact?

RE: BLE + ESB concurrent issue with no active BLE connection

ockwie — Tue, 17 Mar 2026 06:52:10 GMT

Sounds like a radio timeslot conflict—when TX is enabled (esb_timeslot_send_str), it’s likely blocking RX from being scheduled properly. Since RX works fine without TX, the issue is probably timing/scheduling.

Try adjusting timeslot length/intervals or reducing TX frequency to see if RX recovers geo dash