Hi,
I have built my code on top of ble_app_template and im using a custom service. My problem occurs when sending data from an android Samsung S9 (and possibly other android phones) to my nrf52 DK using write without respons cmd. Its the same behaviour if I send 3 packets in a row or 50 packets, the write to characteristic fails after a couple of packets and I get nrf_sdh_ble: BLE event: 0x11. When using my iPhone 11 pro it works out perfect.
Im using Softdevice S132 7.0.1 and sdk 16.0.0_98a08e2
Min conn interval: 15
Max conn interval: 30
NRF_SDH_BLE_GAP_DATA_LENGTH 251
NRF_SDH_BLE_GAP_EVENT_LENGTH 400
NRF_SDH_BLE_GATT_MAX_MTU_SIZE 247
Please let me know if you need any additional information/code to advise in the matter.
Best regards / Rasmus