Created question in FIWARE Q/A platform on 01-02-2019 at 18:02
Please, ANSWER this question AT https://stackoverflow.com/questions/54484127/how-to-send-commands-to-iot-sensors-using-android-application

Question:
How to send commands to iot-sensors using android application

Description:
I setup an the fiware201:iot-sensor inside an Ubuntu 16.04 instance on FIWARE-lab , and am currently building an android application to be able to send commands to access the dummy devices provided by the context provider , i setup a class that formats the data and sends it to the endpoint provided by the tutorial , but i cant seem to get it to work , i get a 422 error whenever i try to send any command.

additional details:
i am using volley -> a package to send post,get requests in android
fiware-lab region : crete

here is the code:

import android.content.Context;
import android.util.Log;

import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

public class ApiController {
private String urlString
public String serverResponse;
private RequestQueue queue ;

public ApiController(Context context)

public void setDevice(String device)

public void send() {
String uri = String.format(Locale.US, urlString);

// Request a string response from the provided URL.
StringRequest stringRequest = new StringRequest(Request.Method.POST,uri,
new Response.Listener<String>() {
@Override
public void onResponse(String response)

}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error)

}
) {
@Override
protected Map<String, String> getParams() throws AuthFailureError

@Override
public Map<String, String> getHeaders() throws AuthFailureError

};

// Add the request to the RequestQueue.
queue.add(stringRequest);
}

}