What is the basic mosquitto_pub command to send text to your Mestastic unit?

1

I am trying to use this format from a command line on Linux to to see if I can receive a text on my Meshtastic device:

mosquitto_pub -h 192.168.1.52 -t ‘msh/2/e/!da638728’ -m ‘{“channel”:“0”,“sender”:“MeAtMyPC”,“type”:“sendtext”,“payload”:{“text” “mqtt-test”}}’

I see the MQTT message appear in the mosquitto_sub terminal but no notifications on my ANDROID App.

Any suggestion would be grateful.

2

See the documentation.
It has to be sent to a channel called “mqtt”, you need a field “from” with the node number and the payload should be just a string with the text.

3

I read that documentation but it doers not show an example of a basic command line for publishing a MQTT message which I am looking for

4

It doesn’t matter how you publish to the topic, I think your command would work but then it should be something like:

mosquitto_pub -h 192.168.1.52 -t ‘msh/2/json/mqtt’ -m ‘{"from": 3663955752, “channel”: 0, “type”: “sendtext”, “payload”: “mqtt-test”}’

This is if your root topic is just msh/. I would recommend checking with MQTT Explorer.

5

Thanks GUVWAF for your input, but where/how do I specifically send a text to a unique Meshtastic device? I see the “from” but not a “to”. Is it inserted into the message field or in into the topic field? And if so, how?

6

Add a field “to” in the message with the node number to send to. This is also in the link I shared.

7

I have added the following

“to”; “!da638728”

but i still see no text being delivered to my device.

Again, I have read that document BUT the topic that I have posted is as follows:

"What is the basic mosquitto_pub command to send text to your Mestastic unit?

Nothing more, nothing less. Could you do this for your own device and once it works, post that here please?

8

First, the documentation says the to needs to the node number, so e.g. 3663955752.
However, it also says this feature is to instruct a node to send out a message. So you don’t directly send a message from your computer to a node, but you instruct a node (the from field) to send a message to another node (the to field) or to a channel.

I don’t use mosquitto_pub, but I’ve used MQTT Explorer to do this.

9

OK then could you send me a known good MQTT syntax line that does work in MQTT Explorer, and I will reverse engineer it from there.

Thank you for your support, for it is greatly appreciated.

10 
{
    "from": 841446079,
    "channel": 0,
    "type": "sendtext",
    "payload": "test"
}

Or to a certain node:

{
    "from": 841446079,
    "to": 2711401735,
    "type": "sendtext",
    "payload": "test"
}

You have to replace the “from” and “to” with your node numbers and publish it to the json/mqtt topic with your root topic, e.g. msh/2/json/mqtt.

11

I was able to do it here: