HTC Nexus 9 tablet 7.0.1 does not see advertisements from BleHeartRateMonitor nRF2840

[brianreinhold]

My HTC Nexus 9 tablet OS 7.0.1  does not see the advertisements from an nRF5840 dongle running the BleHeartRateMonitor demo from pc-ble-driver. All my other Androids do. Is this a known issue with the HTC tablet?

[Turbo J]

Did you remember to manually enable "coarse location" privilege for the app? Android apps need this in order to be able to receive BLE advertisements.

[brianreinhold]

I would suggest adding the following code to the BleHeartRateMonitor

// Set the flags - important to indicate no EDR/BR support for some Androids
data_buffer[index++] = 2; // length of flags data type
data_buffer[index++] = BLE_GAP_AD_TYPE_FLAGS;
data_buffer[index++] = 6; // No EDR/BR support and general discoverable

to add the flags to the advertisement. This will stop Androids from falling back to their default behavior of selecting EDR/BR when nothing is provided. (This is a behavior of the Broadcom stack as I understand it.)