Add support for Nikon COOLPIX B600. #173
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We don't need super high sub-second location updates, reduce it to at most one second updates. Also, add some hysteresis to the GPS fix check. This reduces the GPS fix icon flickering 'warning/fix' all the time.
Reverse engineering shows the remote uses a simplified version of the smart device 4 stage handshake. In particular, the camera does not require the scrambled/encrypted device ID exchange. Remote pairing is now mostly working, able to scan and connect and send shutter release. Remote controller mode does not support focus. Remote controller mode does not appear to use GPS, although the characteristic is active and accepts the write. Currently using FreeRTOS queues instead of task notifications, something weird going on with causing crashes with NimBLE stack.
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