Any changes on API

Hello,
I just upgraded from 4.x to 6.1
Everything seems to be working fine except sending commands via TCP to devices

/devices?uniqueId=xxxxxxxxxxxxxxxxx

returns status 200 but response is empty.
same for the /devices command

I used to have this code working:

....
if (response.status >= 200 && response.status < 300) {
                const messageData = await response.json();
                return messageData[0];  //will contain all device details
 }

now messageData contains [] and thus messageData[0] is undefined

It should still work. Make sure you have permissions for that device.

same code here https://github.com/traccar/traccar-web/blob/de420d4088ee8c34d463e2614f759702e11803e1/src/Navigation.jsx#L77

When upgrading the mySQL DB was migrated too, should I recreate it?

I'm using default admin credentials: admin/admin as email and password to open session
and getting my session: JSESSIONID=node0ofid40ejzis41tpoa06rz7zv55.node0; Path=/

as mentionned earlier even, the /devices call returns empty list

The device still needs to be linked to the user for this to work.

well, any query to do it
when I run select id,uniqueid from tc_devices where uniqueid=353701097550129;
the device is there.
How to link all devices to admin, they used to work for this db, it was an upgrade.

https://www.traccar.org/permissions-groups/

 select * from tc_user_device;

is empty

I did:

insert into tc_user_device(deviceid, userid) select id , 1 from tc_devices;

and now it's working:
I wonder why update emptied the tc_user_device device?

and are the new devices will be linked automatically, I've this config:

    <entry key='database.ignoreUnknown'>false</entry>
    <entry key='database.registerUnknown'>true</entry>
    <entry key='database.saveEmpty '>false</entry>

They won't be linked automatically, but you can automatically add them to a group. That way they will be accessible through the group.