Android Studio: insert data into a Mysql BD

Question

I have this code to insert data into an external database, but when the save button is clicked, it inserts a new entry into the table, but empty. The php script works well because using Postman correctly inserts the data.

 private void insertData() {

        textSensorName = findViewById(R.id.eTSensorName);
        textDescription = findViewById(R.id.eTDescription);
        textAttributes1 = findViewById(R.id.eTAttributes1);
        textAttributes2 = findViewById(R.id.eTAttributes2);
        textAttributes3 = findViewById(R.id.eTAttributes3);
        textAttributes4 = findViewById(R.id.eTAttributes4);

        String nome = textSensorName.getText().toString();
        String descricao = textDescription.getText().toString();
        String s1 = textAttributes1.getText().toString();
        String s2 = textAttributes2.getText().toString();
        String s3 = textAttributes3.getText().toString();
        String s4 = textAttributes4.getText().toString();

        StringRequest request = new StringRequest(Request.Method.POST,INSERT_SENSOR_REQUEST, new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {

                Toast.makeText(getApplicationContext(), response.toString(), Toast.LENGTH_LONG).show();

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

                Toast.makeText(getApplicationContext(), error.toString(), Toast.LENGTH_LONG).show();

            }
        }){
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                Map<String, String> param = new HashMap<String, String>();
                param.put("nome", nome);
                param.put("descricao", descricao);
                param.put("s1", s1);
                param.put("s2", s2);
                param.put("s3", s3);
                param.put("s4", s4);
                return super.getParams();
            }
        };

        RequestQueue queue = Volley.newRequestQueue(getApplicationContext());
        queue.add(request);

    }