console.log("client connected");
 c.on('end', () => {
     console.log("client disconnected");
 });

 c.on('data', (data) => {

     let buffer = data;
     let parser = new Parser(buffer);
     if(parser.isImei){
         c.write(Buffer.alloc(1, 1));
     }else {
         let avl = parser.getAvl();
          
         let writer = new binutils.BinaryWriter();
         writer.WriteInt32(avl.number_of_data);

         let response = writer.ByteBuffer;             
         c.write(response);
     }
 });