millis() in http get requset

Using Arduino Networking, Protocols, and Devices
#1

Please help me, this is my code. I want to replace delay() because its blocking arduino to do others things.

i already replace it by millis() but not work. if someone have solution?

void server_request ()
{

Serial.println("HTTP get method :");
Serial.print("AT\r\n");
SIM900.println("AT"); /* Check Communication */
delay(5000);

Serial.println("AT+SAPBR=3,1,"CONTYPE",""");
SIM900.println("AT+SAPBR=3,1,"CONTYPE","""); /* Connection type GPRS */
delay(5000);

SIM900.println("AT+SAPBR=3,1,"APN","www.apn.com""); /* APN of the provider */
delay(5000);

SIM900.println("AT+SAPBR=1,1"); /* Open GPRS context */
delay(5000);

SIM900.println("AT+SAPBR=2,1"); /* Query the GPRS context */
delay(5000);

SIM900.println("AT+HTTPINIT"); /* Initialize HTTP service */
delay(5000);

SIM900.println("AT+HTTPPARA="CID",1"); /* Set parameters for HTTP session */
delay(5000);

SIM900.println("AT+HTTPPARA="URL","domain-name.com:3000/data?variable1=value1&variable2=value2""); /* Set parameters for HTTP session */
delay(5000);

SIM900.println("AT+HTTPACTION=0"); /* Start GET session */
delay(5000);

//SIM900.println("AT+HTTPREAD"); /* Read data from HTTP server */
//delay(5000);

SIM900.println("AT+HTTPTERM"); /* Terminate HTTP service */
delay(5000);

Serial.println("insertion done");
SIM900.println("AT+SAPBR=0,1"); /* Close GPRS context */
//delay(5000);
}

NB : i put this void in the loop.
please i need your help, because i cant found solution for this problem.
thanks

#2

It is not possible to replace delay() with millis(), you have to rewrite your sketch.

Start with the Blink Without Delay.
Use that for a millis timer of 5 seconds.
Use a counter/index and increment that (every 5 seconds).

One way to do this, is to put all the SIM900 strings in a table, and go through that table in the millis timer.
Which Arduino board are you using ? Perhaps the table can be in PROGMEM.

#3

The demo Several Things at a Time is an extended example of BWoD and illustrates the use of millis() to manage timing without blocking. It may help with understanding the technique.

Have a look at Using millis() for timing. A beginners guide if you need more explanation.

...R

#4