title: What is the protocol of GPS tracking device TK103?
body: <p>I am currently working on getting a location of a vehicle to a server. I am using TK103 as my GPS device. It is sending <code>##,imei:&lt;my_imei&gt;,A;</code> to the server when the server is started. </p>
  
  <p>This is the only document of the protocol I could find on internet: <a href="https://web.archive.org/web/20140401000000" rel="nofollow">https://web.archive.org/web/20140401000000</a>*/<a href="http://www.zhyichina.com/en/gpstracking/gprs-data-protocol.xls" rel="nofollow">http://www.zhyichina.com/en/gpstracking/gprs-data-protocol.xls</a>  </p>
  
  <p>I followed it. But it does not work properly. It needs to send "ON" command many times to work and any of other commands did not work. Could you please help me to identify the problem.</p>