The author USES stm32 sim868 control chip to upload GPS data onenet platform, using interrupt problem, often encountered in the process of data in the code for this with a query AT + CIPSTATUS command network status, if the return is not "CONNECT OK", will the current GPS data cache, and then reconnect the GPRS network, when the AT + CIPSTATUS returns "CONNECT OK" to send data, but the result is bad, often will encounter network returns have been not CONNECT "OK", consult everybody a great god is there good way, in addition, the AT + CIPSTATUS command the return value is sim868 return directly, or contact the network sim868 back???????