ROSLIBJS - Call service - No Respone

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Hello,

I'm trying to call a service using ROSLIB.JS and rosbridge websockets. I can see that the service is being called, and do what it needs to do, but I'm not getting any response.

Here is my JS code:

function initEnginesPowerStateService() {
        console.log("Creating the service");
        var robotPowerStateClient = new ROSLIB.Service({
            ros: ros,
            name: '/get_robot_power_state',
            serviceType: 'my_robot/RobotPower'
        });

        console.log("Creating the service request");
        var request = new ROSLIB.ServiceRequest({});

        console.log("calling the service");
        robotPowerStateClient.callService(request, function (response) {        
            console.log('Result for service call power_state = ' + response);
        }, function(error){
            console.error("Got an error while trying to call power state service");
        });
}

What am I missing?

I'm using latest ROSLIBJS. My ROS version is melodic.

Thanks, Tomer.