Here is it an example of usage:

Edit 
				
					{
    "id": "_ID_",
    "jsonrpc": "2.0",
    "method": "hub.coordinates.set",
    "params": {
          "latitude" :  49.9808100,
          "longitude" : 36.2527200 
     }
}
Edit 
				
					{
    "error": null,
    "id": "_ID_",
    "result": {}
}