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Add note about 'from' field being signed in JSON

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GUVWAF 2023-07-25 20:57:16 +02:00
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docs/software/mqtt/index.mdx
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@ -78,7 +78,7 @@ The meaning of these fields is as follows:
- "`id`" is the unique ID for this message.
- "`channel`" is the channel index this message was received on.
- "`from`" is the unique node number of the node on the mesh that sent this message.
- "`from`" is the unique node number of the node on the mesh that sent this message, represented as a signed decimal number.
- "`id`" inside the payload of a `NODEINFO_APP` message is the user ID of the node that sent it, which is currently just the hexadecimal representation of the node number.
- "`hardware`" is the [hardware model](https://github.com/meshtastic/protobufs/blob/master/meshtastic/mesh.proto#L215) of the node sending the `NODEINFO_APP` message.
- "`longname`" is the long name of the device that sent the `NODEINFO_APP` message.
@ -88,6 +88,8 @@ The meaning of these fields is as follows:
- "`to`" is the node number of the destination of the message. In this case, "-1" means it was a broadcast message (this is the decimal integer representation of `0xFFFFFFFF`).
- "`type`" is the type of the message, in this case it was a `NODEINFO_APP` message.
The "from" field can thus be used as a stable identifier for a specific node. Note that (like the "`id`" and "`to`" fields) in JSON this is a signed value, whereas in protobufs it is unsigned.
If the message received contains valid JSON in the payload, the JSON is deserialized and added as a JSON object rather than a string containing the serialized JSON.
**Sent messages** will be checked if the MQTT payload contains a valid JSON-encoded envelope: