On 16 Apr 2004, at 4:52, Nathanael P wrote: ... I am going to write a program with xcode that could sends at command using bluetooth and recieve response (like hyper terminal in windows). [mRFCOMMChannel writeSync:"at+cmgf=1/n" length:16]; Do I make mistakes? Thanks for your help. There are three mistakes on that last line. Firstly, the length of the data you are sending looks like it was intended to be 10 bytes, so you need to set the length to that. Since you are only sending strings rather than binary data I would recommend using something like: char *s; ... s = "<your command to send>"; [mRFCOMMChannel writeSync: s length: strlen(s)]; Secondly, you have the slash the wrong way around; I'm pretty sure that you meant to write "at+cmgf=1\n" Thirdly, you shouldn't be using "\n" (new line) anyway, you should be sending a "\r" (carriage return) instead. Cheers, Nicko _______________________________________________ bluetooth-dev mailing list | bluetooth-dev@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/bluetooth-dev Do not post admin requests to the list. They will be ignored.