Question

Hello,

I would like to use the I/O juggler (digital input raising edge) action to trigger a MQTT publish. Can this be done with a simple shell script? Appreciate if someone could point me in the right direction.

Thank you, MF

Comments

Mark, did you ever get an answer on this? I have the same issue.

My script is:

/usr/bin/logger "MQTT Script Initiated"
mosquitto_pub -h localhost -p 1883 -t router/get -m uptime
/usr/bin/logger "MQTT Script Completed"

I get the first and last lines showing up in the logger. However the mosquitto line does not work. It does work if I simply type that line into an SSH session

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Hi Graybricks

I followed the answer below and after some mucking around managed to get the DI raising edge to trigger and MQTT publish.

Regards

Mark

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Mark,

Thanks for replying. It's the "mucking around" I'm interested in. What magic did you have to do in your script to get mosquitto_pub to start working? I've done my homework here, I have read the below, but can't get it. You can DM me if you don't want to broadcast the answer.

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Well, figured out that if I make the script with notepad++, it doesn't work. If I go into WinSCP, open the script file on the modem, and edit it there, save it, the script works fine. Thanks.

Answer 1

Hello,

You can find some useful information on MQTT in this wiki page.

Aside from that, You would indeed need a script to implement such a configuration.

The necessary steps to in perform include:

• Configuring Script type action in Services -> Input/Output -> I/O juggler;
• Configuring an instance execute the action on rising edge during input state change;
• Downloading MQTT package from Package manager;
• Configuring MQTT Broker and Publisher in Services -> MQTT section;
• Loging to the router using SSH and downloading mosquitto_pub using the following commands: 
  • opkg update
  • opkg install mosquitto-client-nossl
• Finally, the script should execute the command similar to the one below:
  •  mosquitto_pub -h 192.168.1.1 -p 1883 -u <user_name> -P <password> -t router/get -m <data_to_publish>

Best regards,

Comments

Thanks, they is good step by step instructions, however I have stumbled on a few problems detailed here: mqtt_publish_from_IOjuggler_details

Thank you for your assistance, very much appreciate it.