I don't think that's possible. Because of the way app's connect to BLE devices, the original app is communicating directly with the sensor. The phone's OS (and therefore other app's) don't really have access to that sensor. For example, if you have RunKeeper connected to a HRM, RunKeeper controls the BLE connection. Other app's cannot simultaneously use that HRM. Also, keep in mind that iPhones cannot connect to ANT sensors without an external adapter. Only one company made such an adapter and I don't think they make it anymore.
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