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Determine if the RADIO module has detected an active carrier

Hiya,

I'm working on a mesh network protocol for the nrf51822, it involves multiple waves of re-transmissions, with devices in the vicinity repeating packets at near enough exactly the same time (within one or two clock cycles).

The protocol itself largely works, however there are a large number of incorrect crcs received which is due to multiple devices trying to initiate a transmission wave at the same time as another device.

The datasheet suggests that the earliest time that software can learn another device is transmitting is when the ADDRESS event is received; is there a mechanism to detect this any earlier?

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