- Message Type: Data1
- Direction: From Drone
- Response Payload: 7 bytes described below
The File Size message is sent by the drone once it is ready to transmit a file (eg. a JPEG photo).
1 = JPEG
Little-endian 32-bit unsigned integer
Little-endian 16-bit unsigned integer
The message must be ack'd with a File Size message with a payload of a single zero byte.