Mosquitto+AirVatage+MqttClient on mangOH Green with wp7607?

gavinoimparato1 · April 12, 2021, 8:07am

Hi
I’m working for the first time with mangOH green.
I am having a little difficulty in understanding how communication with Mosquitto MQTT broker works. In particular, I did not understand how to send messages and especially how to program and put together the three elements:

Mosquitto
MqttClient based on Paho
AirVantage (which could be used as a broker?).
Could you by any chance be kind enough to explain to me how these elements interact with each other? Have I to work in the paho-based folder?

Contribute to mangOH/MqttClient development by creating an account on GitHub.

I installed Mosquitto on my virtual machine, I also made some small pub / sub applications, but I really don’t know how to use it in a larger project. I also registered my mangOH device on AirVantage. I would also be very happy if you knew of any tutorials. Thank you very much for your attention and again sorry for the inconvenience.

jyijyi · April 12, 2021, 8:40am

you can capture wireshark log and see if the application sends out TCP packet on the MQTT server

gavinoimparato1 · April 12, 2021, 9:19am

Who is the Mqtt server? Mosquitto? The broker?

jyijyi · April 12, 2021, 9:19am

please google it by “wireshark linux”

gavinoimparato1 · April 12, 2021, 9:24am

yes, thank you, but I did not understand what it has to do with what I asked, in the sense that I would like to understand how to use in my communication the three elements Mosquitto, MqttClient folder based on Paho and AirVantage …

[image]

jyijyi · April 12, 2021, 9:30am

using wireshark can let you know if your legato application is sending out TCP packet out correctly.

good luck!

gavinoimparato1 · April 12, 2021, 9:34am

Ok but my question was different…

jyijyi · April 12, 2021, 9:48am

you might have a look on this sample code:

gavinoimparato1 · April 12, 2021, 10:24am

okay. I followed this tutorial:

github.com

nhonchu/mqttClient-for-Legato/blob/master/README.md

mqttClient for Legato
============

This MQTT-client API enables your application to easily interface with MQTT broker.
The following brokers have been tested :

- Sierra Wireless AirVantage server (eu.airvantage.net)
- Eclipse Paho MQTT server (iot.eclipse.org)
- Orange Business Services Live Objects MQTT bridge (liveobjects.orange-business.com)
- Google Cloud Platform's MQTT bridge (mqtt.googleapis.com)
- Amazon AWS-IoT
- Microsoft Azure IoT Hub


There are 4 separate Legato applications in this package:

- __mqttClient__ : API app exposing key MQTT features to other Legato apps over IPC (mqttClient.api). This new version can handle multiple MQTT instances (multiple Legato apps can interface with different MQTT brokers concurrently). This application must be installed on the target.
- __mqttCLI__ : Sample application implementing a Command Line Interface, it relies on the above __mqttClient__. This tool is a good starting point to explore MQTT capabilities or to test a broker, as coding is not required. You can issue commands to connect to a MQTT broker, publish data to topics, subscribe to topics, view incoming messages pertaining to subscribed topics.
- __mqttClientSample__  : Sample application showcasing how to use __mqttClient__ API to interface with a MQTT broker (AirVantage & iot.eclipse.org). You can start with this sample app to create your own mqtt app.
- __mqttGoogleCLI__ : Sample application implementing a Command Line Interface to connect to Google Cloud Platform's MQTT bridge. It relies on the above __mqttClient__. Coding is not required, so you can quickly have hands-on experience with Google's MQTT bridge.

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I correctly installed mqttClientSampleApp (because it fits to my goals), I runned it:

But i didn’t understand what to do because on the guide i see the command mqtt in the shell, but in my case it doesn’t work:

How can I install it? On the guide I see:

jyijyi · April 12, 2021, 10:34am

seems you did not export path

gavinoimparato1 · April 12, 2021, 10:36am

Do you say it?

Isn’t it for GCloud?

jyijyi · April 12, 2021, 10:37am

not sure, probably you need to debug by yourself as i don’t develop this application

gavinoimparato1 · April 12, 2021, 10:41am

I extracted the path but obtain this error (and log)…

jyijyi · April 12, 2021, 10:55am

gavinoimparato1 · April 12, 2021, 11:15am

I’m trying but if I include mqttCLI in apps folder it doesn’t work, neither if I give the .adef file path:

gavinoimparato1 · April 12, 2021, 12:32pm

Could be this the problem?

jyijyi · April 12, 2021, 12:42pm

No problem is found in the sample app

github.com

legatoproject/legato-af/blob/master/apps/sample/mqtt/mqttPublisher.adef

sandboxed: true
start: auto

executables:
{
    testPublisher       = (testPublisher)
}

processes:
{
    run:
    {
        (testPublisher)
    }

    faultAction: restart
}

bindings:
{

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You can port the app to there

gavinoimparato1 · April 12, 2021, 1:06pm

I have to include app in green.sdef file not?

jyijyi · April 12, 2021, 1:11pm

I don’t think so … …

gavinoimparato1 · April 12, 2021, 1:24pm

what do you mean so for “port the app here”?

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Mosquitto+AirVatage+MqttClient on mangOH Green with wp7607?

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