RE: nrf52-ble-app-uart-relay does not connect with IPhone

Simonr — Thu, 05 Jan 2023 13:19:27 GMT

Usually, when an applications work with other phones than iOS, it's due to the iOS' strict limits on what it allows for in a connection. The connection interval and MTU sizes being the most common culprits. You can try tweaking the min_conn_interval to 25 ms, as well as lowering the NRF_SDH_BLE_GATT_MAX_MTU_SIZE and NRF_SDH_BLE_GAP_DATA_LENGTH config to 181 and 184 respectively, as I think those are the values set in iOS that it is allowed to connect to. If that doesn't help, are you able to see any kind of logging information on the phone side that might give us an idea of what exactly is going wrong on the phone side.

Best regards,

Simon