title: SIM900 error 601 when sending a second POST
body: <p><strong>Using SIM 900</strong> :</p>
  
  <p><code>AT+HTTPINIT</code></p>
  
  <p><code>AT+HTTPPARA="CID",1</code></p>
  
  <p><code>AT+HTTPPARA="URL","www.onewebsite.fr"</code></p>
  
  <p><code>AT+HTTPDATA=lengthofpostdata, 10000</code></p>
  
  <p>sending data</p>
  
  <p><code>AT+HTTPACTION=1</code></p>
  
  <p><code>AT_HTTPREAD=0, lengthofreceiveddata</code></p>
  
  <p><strong>Up to that point everything works OK</strong></p>
  
  <p><strong>Then i send a new request :</strong></p>
  
  <p><code>AT+HTTPPARA="CID",1</code></p>
  
  <p><code>AT+HTTPPARA="URL","www.onewebsite.fr"</code></p>
  
  <p><code>AT+HTTPDATA=lengthofpostdata, 10000</code></p>
  
  <p>sending data</p>
  
  <p><code>AT+HTTPACTION=1</code></p>
  
  <p><strong>Then I received the message :</strong> <code>+HTTPACTION=1,601,0</code></p>
  
  <p>Any idea ?</p>