Send command "how-to"

[ghost]

Hello,

Traccar3.2 but last traccar-web.war (12-23)

I want to send cut OFF/ON engine, I don't know where/howto parameter SMS function please ?

Thanks.

[vitalidze]

I think you should either use the Engine Stop/Engine Resume commands, if they are supported by your device and implemented in traccar backend (this should be reported when you try to send the command). Another option is to try with Custom command. You should read documentation about your device on which commands you can send and their format.

[ghost]

What I don't understand is : how traccar knows howto send the command ? Usualy whith my own phone, I send sms command to the device. If I write the #stop#passwd# this command must go out my server; how does it do that ? Do I need a center sms server ?

[vitalidze]

It sends commands over the internet channel, which is opened when your device connects to the traccar server. Again, your device must support this way of communication. Maybe your particular device can support SMS commands only. To figure that out you should either read documentation about your device.

[khfrabbi]

I am getting below message after sending any command to "Meitrack T1"
Please guide

Traccar 3.3
Traccar-web 0.10.2

{"reason":"java.lang.ClassNotFoundException: org.traccar.model.Factory","success":false}

[vitalidze]

It is not supported with traccar 3.3 for now. Use 3.2 instead

воскресенье, 3 января 2016 г. пользователь khfrabbi написал:

I am getting below message after sending any command to "Meitrack T1"
Please guide

Traccar 3.3
Traccar-web 0.10.2

{"reason":"java.lang.ClassNotFoundException:
org.traccar.model.Factory","success":false}

—
Reply to this email directly or view it on GitHub
#440 (comment)
.

Kind regards, Vitaly Litvak

[khfrabbi]

As per your suggestion I did, now it shows another message

{"reason":"The device is not registered on the server","success":false}

What can I do to register my device on the server?

Meitrack T1 Device
Traccar 3.2
Traccar-web 0.10.2

[vitalidze]

This means that at the moment you were trying to send command your device wasn't connected to the server.

[khfrabbi]

I don't know what mistake I did.

• Reinstalled Traccar 3.2 & Traccar-web 0.10.2
• Sending command
• Instead of the result of sending command as mentioned below link, it's appear "{ }" in a popped up window.
  http://traccar.litvak.su/features/commands.html

Please suggest what can I do now

NB : Commands using SMS working fine on my Meitrack T1 Device

[vitalidze]

@khfrabbi most probably it was sent if you don't see an error message. Are you sure that particular command is supported by traccar and your device?

Have you tried sending same command from the original UI? If it does not work from there then it's better to ask same question here

[hanselsen]

@vitalidze I have the same issue like stated here earlier.
{"reason":"java.lang.ClassNotFoundException: org.traccar.model.Factory","success":false}
We really would like to keep using 3.3. When do you think is this resolved?
Thanks!

[vitalidze]

@hanselsen I don't have any estimated date. It will be resolved when I find some free time to install version 3.3 and update instructions.

[hanselsen]

Allright thanks for the quick reply. I will be patient then. Good luck.

[hanselsen]

@vitalidze On https://github.com/vitalidze/traccar-web/blob/dev/src/main/java/org/traccar/web/server/model/DataServiceImpl.java#L1020 there is the error. But I see that local variable isn't used afterwards. Maybe a solution to just throw away line 1020?

[vitalidze]

@hanselsen It is used on the next line.

[hanselsen]

Oh stupid. I search for it using CTRL+F but there was a whitespace after it, so it wasn't found. Haha excuse me

[hanselsen]

@vitalidze I've created, from what I think, a workaround (or solution). Would you care to take a look at my approach?
DataServiceImpl.zip

[vitalidze]

@hanselsen so your only change is that you have removed this line

Class<?> backendFactoryClass = Class.forName("org.traccar.model.Factory");

And changed this one:

Method objectFromJson = backendJsonConverterClass.getDeclaredMethod("objectFromJson", Reader.class, Class.class);

Right?

It looks correct for version 3.3, but it won't work for version 3.2 and 3.1. I cannot do it this way because I want compatibility for all versions of traccar that support sending of commands. Anyway, thank you for the suggestion.

My solution would be to surround Class.forName for the '...Factory' argument with try..catch and in catch block just use your solution. Something like this:

// ...
Method objectFromJson;
try {
    Class<?> backendFactoryClass = Class.forName("org.traccar.model.Factory");
    objectFromJson = backendJsonConverterClass.getDeclaredMethod("objectFromJson", Reader.class, backendFactoryClass);
} catch (ClassNotFoundException e) {
    objectFromJson = backendJsonConverterClass.getDeclaredMethod("objectFromJson", Reader.class, Class.class);
}
// ...

[hanselsen]

Yes, but I also enhanced the Catch clause, so that if the Command is not supported, not a crash will display, but it's showing that it's not supported.

Anyhow, for the backwards compatibility, I think you're definitely on the right track. Although I'm not very fond of try and catch for implementing behaviour, but I googled a bit and it seems you're solution is the way to go.

[ahmedtab]

Hello
I would be glad if you can figure this out please. When I send any command the respond is
{"reason":"java.lang.reflect.InvocationTargetException: null","success":false}
Using Traccar 3.2,Traccar-web 0.10.3, device is EV601.
I tryed it on my server and within your demo server and the result is always same.
I think my device is not supporting sending commands in tracker-server , yet what about a Custom type?. Are there any modifications? must I do it in tracker-server or in traccar-web.
Thanks

[vitalidze]

@ahmedtab to figure out the reason of what's happening please provide contents of wrapper.log file right after you reproduce the issue. It should contain a stack trace of the error. If your device does not support commands yet, then it's better to ask on the backend issue tracker: https://github.com/tananaev/traccar/issues

As for the "Custom type" it may work if your command is a text command and you set it in a proper format. I would play with custom commands in your case.

[vitalidze]

Fixed, written news, updated latest and demo versions.