Add conservative multicast mode for location sharing #12
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This provides a conservative multicast mode in esp firmware to allow users to share ONLY the position of vehicles among each other when they are connected to a common access point. The method of establishing communication among the vehicles is similar to the full multicast mode. The esp modules need to be connected to a common access point and have same multicast ip and port. The vehicles would be able to share just the GLOBAL_POS_INT (and FOLLOW_TARGET) messages with each other this way. This would save huge amount of bandwidth. The reduction in traffic would allow more vehicles to be connected using multicast and ensure reliable connection for follow and avoidance purposes.
This should be merged after #11.