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This particular gesture definition is reserved, and is known as the ''beacon gesture''. It is defined by a strict Type of 1, 0 State Flags, a unique source identifier, a broadcast destination identifier, an empty payload, and a checksum.  

This particular gesture definition is reserved, and is known as the ''beacon gesture''. It is defined by Source & Destination Identifiers of 15 (broadcast), 0 Flags, 0 Length, and a data frame consisting only of a 1 byte ABI.  

The beacon gesture indicates to all boards in the flight stack the presence and identity of a given board. Since all identifiers are enumerated within the STINGR source code, a beacon gesture allows any board to identify what boards are in the stack. Hence, if, for example, Macaw were to send a beacon gesture, with its identifier of 00000010, all boards would receive this gesture, correlate the identifier to that of Macaw, and consequently be aware of the presence of Macaw in the flight stack.

The beacon gesture is transmitted to the entirety of the stack, and uniquely identifies a given board as being present in the flight stack. In the initialization phase, each board transmits the beacon gesture every 2 seconds. The Avionics waits 5 seconds to receive all beacon gestures, then re-assigns the received ABI's into FSI's. The FSI's are then provided to STINGR, which provides the FSI's to all other boards in the stack. Once the FSI's have been re-assigned and re-distributed, the initialization phase is over.

Once a board in the flight stack has sent its beacon gesture, it is now ''live'', and other boards are allowed to send it messages using STINGR. By means of each board in the flight stack sending out a beacon gesture, all boards will be aware of the full definition of the flight stack.  

Once the FSI's have been distributed, all boards in the flight stack are now "live" and are able to send and receive messages via STINGR. Until the FSI's are distributed, a board is not live, and STINGR will not allow any messages to be transmitted or received by the given board.

 

The initialization routine is limited to 5 seconds -- the time that the avionics waits to receive all beacon gestures.

=== Standard Mode ===

=== Standard Mode ===