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So how do I deal with supporting both Android and iOS from a single Beacon?

I believe the easiest approach would be to broadcast both formats.

Interested to know how you intend to do that with all the advertising space already used up by one of the beacon advertisements?

One option is to alternatively switch between both broadcasts on a single radio.

You broadcast a single iBeacon-only message, sleep for a few hundred miliseconds and then broadcast a new AltBeacon message.

The beacon does this so quickly, that it's usually sending out two or three of both kind of messages every second. It's effectively an iBeacon + AltBeacon in one device.

You can use this example to send this example code on github to run multiple advertisers. (May be a bit of overkill to just send 2 kinds of beacons but does provide accurate timing control over the beacons). http://nordicsemiconductor.github.io/nRF51-multi-role-conn-o....

However it is really a waste of energy to send 2 types of beacon packets when one should suffice. However it is technically possible.

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