mavlink官方文档入口
协议概述
MAVLink 是一种二进制遥测协议，专为资源受限的系统和带宽受限的链路而设计。MAVLink部署有两个主要版本：v1.0和v2.0，v2.0向后兼容（v2.0实现可以解析和发送v1.0数据包）。遥测数据流以多播设计发送，而改变系统配置并需要保证传输（如任务协议或参数协议）的协议方面是点对点重传。
MAVLink 2 数据包格式
以下是MAVLink v2数据包的在线格式。内存中的表示可能有所不同。
uint8_t magic; ///< protocol magic marker
uint8_t len; ///< Length of payload
uint8_t incompat_flags; ///< flags that must be understood
uint8_t compat_flags; ///< flags that can be ignored if not understood
uint8_t seq; ///< Sequence of packet
uint8_t sysid; ///< ID of message sender system/aircraft
uint8_t compid; ///< ID of the message sender component
uint8_t msgid 0:7; ///< first 8 bits of the ID of the message
uint8_t msgid 8:15; ///< middle 8 bits of the ID of the message
uint8_t msgid 16:23; ///< last 8 bits of the ID of the message
uint8_t payload[max 255]; ///< A maximum of 255 payload bytes
uint16_t checksum; ///< CRC-16/MCRF4XX
uint8_t signature[13]; ///< Signature which allows ensuring that the link is tamper-proof (optional)