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FTP - clarify MAVFTP maps closely to FTP

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Hamish Willee
2022-02-17 10:12:16 +11:00
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# File Transfer Protocol (FTP)
The FTP Protocol enables an FTP-like file transfer protocol over MAVLink.
The File Transfer Protocol (FTP) enables file transfer over MAVLink.
It supports common FTP operations like: reading, truncating, writing, removing and creating files, listing and removing directories.
> **Note** MAVLink FTP implementation closely follows the design of the original internet [FTP protocol](https://en.wikipedia.org/wiki/File_Transfer_Protocol) in terms of the message structure, sequences, and the supported opcodes/operations.
> Developers can read the Internet protocol RFCs to understand MAVLink FTP.
The protocol follows a client-server pattern, where all commands are sent by the GCS (client),
and the Drone (server) responds either with an ACK containing the requested information, or a NAK containing an error.
The GCS sets a timeout after most commands, and may resend the command if it is triggered.