Mistery is solved. To get a valid token, you need to run
Code
curl -X POST http://192.168.0.106:8080/auth/token
-H "Content-Type: application/json"
-H 'Authorization: Basic Y2xpZW50SWQ6Y2xpZW50UGFzcw=='
-d '{
"username": "admin",
"password": "myPassword",
"grant_type": "password"
}'
The string in header "Authentication: Basic" Y2xpZW50SWQ6Y2xpZW50UGFzcw== needs to be exactly like this (decoded value is "clientId:clientPass".
Running this curl, the access token is returned.