checking sim900 last byte sent to controller

[mohamed.elsabagh]

How a micrcontroller connected ti sim900 would know the end of packet send by the sim900.
For example if i send the AT command AT to sim900 it responses with OK so how would i make my controller know that the byte which contains the 'K' is the last byte from the sim900 module without using software delays???

 

[Debasis Swain]

You can test using the following format
Commands are usually followed by a response that includes.”<CR><LF><response><CR><LF>”

 

[mohamed.elsabagh]

But What if in the response there are several <CR><LF> and i can't know how many of them such as reading a message or reading webserver data

 

[Debasis Swain]

Any command followed by" <CR><LF><response><CR><LF>"

*But remember one thing the command will be echo first.