Sending MQTT commands

[Jorge]

Hi, I have a question.
I have been working with rapidscada with mqtt communication, receiving data with no problem but now I want to send commands, for now, I want to do this with a button in a scheme, but I have not found any documentation about this

I added commands to the MQTT client but further than that I have not been able to send actual commands from a scheme.

[Mikhail]

Hi,

In the Administrator app, right-click the device, choose Send command. Type the tag code as a command code and send. Does it work? If not, check a communication line log.

[Mikhail]

You don’t need to add commands in the device properties. You can just write data to elements of subscriptions.

[Jorge]

I created another device for sending commands because I am working with 2 different devices(one to subscribe (works) and the other one to send commands (doesn’t work)). Also, this is deployed on a Linux machine, while the administrator runs on Windows.

For the new device, I added a subscription with the topic where I want to send commands then I right-clicked the devices, selected “send command…” and typed the command in the command code, the command I need to send is JSON formatted
{"devEui":"a8404152d185b432","confirmed":true,"fPort":5,"data":"AwAA"}

In the Line Log when I send a command, it says:

2024-11-26 10:47:17 Command '{"devEui":"a8404152d185b432","confirmed":true,"fPort":5,"data":"AwAA"}' to the device [3] MQTT LT-22222-L
Error: invalid command

if i enter the linux machine via ssh and send this command via mosquittoMQTT it works:
mosquitto_pub -h localhost -p 1883 -t 'application/861cbd58-9d39-4046-a074-b6d47e40dec7/device/a8404152d185b432/command/down' -m '{"devEui":"a8404152d185b432","confirmed":true,"fPort":5,"data":"AwAA"}'

thanks for your time

• This reply was modified 1 week ago by Jorge.

[Mikhail]

Please provide screenshots of the settings, and commands sent.

[Jorge]

no problem.

this is the line option:

this is the Device 1 properties (works fine, I receive data):

this is the Device 2 properties (not working, can’t send commands)

this is how I send the command:

[Mikhail]

1. I recommend to use short Tag codes for your convenience.
2. When you send a command, specify the tag code in the Command code field.
Command value is data to send, just a number.

[Jorge]

Hi, I managed to send commands, I created a communication line for each topic, and then in the communication line for sending commands, I made an MQTT client device, added a subscription to the topic I wanted to send commands then added 2 commands to switch a relay, while adding the commands, in the command code a had to put the actual command I want to send and if not, does not work, and finally to send the command, right click on the devices, select “Send Command…” put the command I want to send in the command code and the string data.

now I am working to do this with a button from a scheme.

[Jorge]

On the same line of questions, I want to send the JSON payload through a button, but I can’t get the format. In the channel device configuration, I select String as the Command format, but the output of pressing the button is in hex, and with this method, I get an error: invalid command.

the payload is this:
{“devEui”:”a8404152d185b432″,”confirmed”:true,”fPort”:5,”data”:”AwAA”}

the output of pressing the button is this:

output line log:

[Mikhail]

Please send screenshots:
1. A screenshot of the correct command when you send it from the Administrator app.
2. Screenshot of a command when you send it with a button.

[Jorge]

here there are

the correct command when it is sent from the administrator:

the same command when it is sent from the button:

Also, the log line shows the error when the command is sent from the button and OK when it is sent from the administrator.

[Jorge]

I don´t know if this is helpful.

the commands sent from the button are the ones without the “Code” value

[Jorge]

I notice that when I send the command with the button, there is no command code, but when it is sent from the administrator, the command code needs to be the same as the command code from the device properties. If not, I get an error when I send the command from the administrator.

[manjey73]

https://postimg.cc/cKqCQpCn – Here you send a command with the numeric code 0, in the Code line you have the command text, not the channel tag code with the command

[Mikhail]

Likely, the channel properties are incorrect. Make sure that the tag code of the channel is set.

[Author]

Posts