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=== Point-to-point SSI ===
Point-to-point messaging with SSI can be done with SSI/UART. SSI UART message consists of a 3-byte UART header, SSI message as payload and an optional [[CRC|Cyclic redundancy check]] [[checksum]]. The use of checksum is defined by SSI message/command type, with lower case commands indicating the use of CRC. The header consists of start byte (0xFE), 2-byte (total) length of message and 2-byte [[bitwise]] [[NOT|Negation]] of length bytes to help identifying the frame start.
=== Networking SSI ===
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