[APP][Pro] Advanced Rest Client (ARC) [Abandoned]

Help me understand I’m creating a “post” request of the text type - Screenshot by Lightshot getting an empty body Screenshot by Lightshot

Hi. I am completely new to REST but thing there is an option to solve my problem with this app. I have a wall charger box with an interface where I can get a status response with the following call.

http://xxx.xxx.x.xxx:8080/servlet/rest/chargebox/status
Response is
{“serialNumber”:2315542,“ocppState”:null,“connectedToInternet”:true,“freeCharging”:false,“ocppConnectionState”:null,“connector”:“CHARGING_FINISHED”,“mode”:“ALWAYS_ON”,“currentLimit”:16,“factoryCurrentLimit”:32,“switchCurrentLimit”:16,“powerMode”:“ON”,“currentChargingCurrent”:0,“currentChargingPower”:0,“accSessionEnergy”:5700,“sessionStartTime”:1634387039001,“chargeboxTime”:“17:13”,“accSessionMillis”:7692042,“latestReading”:364600,“chargeStatus”:80,“updateStatus”:{“serialsToUpdate”:,“serialsUpdated”:,“currentlyUpdating”:-1,“currentProgress”:-1,“failedUpdate”:“NO_ERROR”},“currentTemperature”:25,“sessionStartValue”:358900,“nrOfPhases”:1,“slaveControlWarning”:false,“supportConnectionEnabled”:false,“datetimeConfigured”:true,“pilotLevel”:6,“mainCharger”:{“reference”:null,“serialNumber”:2216542,“lastContact”:1634394247897,“online”:false,“loadBalanced”:false,“phase”:0,“productId”:120,“meterStatus”:0,“meterSerial”:“125388V”,“chargeStatus”:80,“pilotLevel”:6,“accEnergy”:364600,“firmwareVersion”:7,“firmwareRevision”:8,“wifiCardStatus”:2,“connector”:“CHARGING_FINISHED”,“accSessionEnergy”:5700,“sessionStartValue”:358900,“accSessionMillis”:7692042,“sessionStartTime”:1634387039001,“currentChargingCurrent”:0,“currentChargingPower”:0,“nrOfPhases”:1,“twinSerial”:-1,“cableLockMode”:0,“minCurrentLimit”:6,“dipSwitchSettings”:8090},“twinCharger”:null}

I have tried to use the app but do not understand how to. I would like to read status of some of the parameters but also control some of them.
Can you point me in the right direction