Turn on LED on multiple nrf52 DK boards with one switch on mobile app

[mialo_5]

I am looking at the android version of the Blinky application and was trying to make some modifications to enable the LED3 on multiple boards (peripherals) to turn on from a single switch on a mobile app.

Has anybody done something like this before or is there an example that I missed that can showcase this functionality?

I do realise the Blinky app has to pair with a device and then can only access that devices services (button and LED), so is there an way to pair and connect multiple devices and send the same command to all devices (and is there a limit to number of simultaneously paired devices)?

Any assistance would be much appreciated.

[awneil]

These are Android questions - nothing specifically to do with Nordic.

BLE has no provision for "broadcasting" - see: https://devzone.nordicsemi.com/f/nordic-q-a/38104/ble-one-to-many/146986#146986

and: https://devzone.nordicsemi.com/f/nordic-q-a/34195/s132-nus-central---broadcast-to-multiple-connected-peripherals

Instead, you have send the same message to each connection in turn.

Whether Android has any utilities to automate this (like sending SMS to multiple recipients) is, again, an Android question - nothing to do with Nordic.

EDIT

Sorry, when I say "Android" that should be "Mobile OS" - whether it's Android, or iOS, or whatever ...