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The length field in an MQTT packet carries the _total_ length of the packet. If it is below 256 (i.e. fits in one byte) only one byte is used for the length field. If it is larger than that 3 bytes are used, with the first byte having the value `0x01` and the remaining bytes representing the length in as a 2 byte unsigned integer in network byte order. Resulting from that it can be assessed that the check in `emcutes`'s `set_len()` function is wrong as it needs to be checked if `len` is lesser or equal to `0xff - 1`. `len <= (0xff - 1)` can be simplified to `len < 0xff`. For some larger packages this safes 2 bytes of wasted packet space. |
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| .. | ||
| application_layer | ||
| ble | ||
| credman | ||
| crosslayer | ||
| gnrc | ||
| link_layer | ||
| netdev_test | ||
| network_layer | ||
| routing | ||
| sock | ||
| transport_layer | ||
| doc.txt | ||