TTY programming
I have seen loads of postings but no real answer to this: I write() a command to the modem I read() to try to get a response, i.e. OK or if the command is a dial, BUSY or such. I do not get anything. The commands, dialing, all seem successful and the application works. I simply cannot report any status. Any ideas? -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: TTY programming
On Tue, Dec 2, 2008 at 4:34 AM, David Baron [EMAIL PROTECTED] wrote: I have seen loads of postings but no real answer to this: I write() a command to the modem I read() to try to get a response, i.e. OK or if the command is a dial, BUSY or such. I do not get anything. The commands, dialing, all seem successful and the application works. I simply cannot report any status. Any ideas? This code should work: http://wiki.emqbit.com/how-to-query-a-modem Regards. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: TTY programming
On Tue, Dec 2, 2008 at 9:34 AM, David Baron [EMAIL PROTECTED] wrote: I have seen loads of postings but no real answer to this: I write() a command to the modem I read() to try to get a response, i.e. OK or if the command is a dial, BUSY or such. I do not get anything. The commands, dialing, all seem successful and the application works. I simply cannot report any status. Any ideas? You're asking people to debug a program that they have never seen. That's a tough thing to do. I have three suggestions: 1. Use strace(1) to trace the system calls your program makes. Then run minicom under strace(1) and issue the same commands to the modem manually. Compare the system call traces. 2. Go read the source code for a program (or ideally several) that does something similar to what you need. 3. Buy the first edition of W. Richard Stevens' book Advanced Programming in the Unix Environment. It contains a chapter on tty programming (featuring a program that does bidirectional communication with a PostScript printer). Later editions of this book omit that chapter; TTY programming is hardly mainstream. James. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: TTY programming
On Tue, Dec 02, 2008 at 11:34:05AM +0200, David Baron wrote: I have seen loads of postings but no real answer to this: I write() a command to the modem I read() to try to get a response, i.e. OK or if the command is a dial, BUSY or such. I do not get anything. The commands, dialing, all seem successful and the application works. I simply cannot report any status. Any ideas? Many modems have a quiet or echo mode that can turn on/off output of status messages, e.g., ATe0 or similar. Ken -- Ken Irving -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
