mbed_BLE_test

This is an extension of the mbedOS battery example. It includes the environmental service and uses the sensor on the Arduino Nano 33 BLE Sense board.

Public and Random BLE address on macOS

By default the mbedOS library advertises with Random Addresses. This is different than the default for the Arduino BLE library which uses the Public Address to advertise. This difference caused connectivity problems with macOS clients. An iOS 14 (either iPhone or iPad) could connect but the similar client on a macOS 10.15 (Catalina) machine would scan but not connect. Using the PacketLogger application include in the XCode Extra Tools, I was able to observe the difference between connecting to a public and random address. Forcing the mbedOS peripheral to advertise with the public address resolved the problem.

    ble_error_t error = _ble.gap().setAdvertisingParameters(
        ble::LEGACY_ADVERTISING_HANDLE,  
        ble::AdvertisingParameters()
          .setOwnAddressType(ble::own_address_type_t::PUBLIC)
          .setTxPower(8)
          );