G'Day, I am writing a script (in Lua) to transmit to/read from a serial device (in this case, a GSM modem). Whilst I have no difficulty with most normal aspects (eg transmit AT, read back OK), I seem unable to use the SMS properly. As a brief description of what should happen, I transmit `AT+CMGS=(phone number)' and receive back a `> ' prompt to let me know it is ready for the message. If I send that line and the message in interactive mode (waiting to see the `> ' appear in minicom before sending the message), then it works fine (so the basic concept seems to be right), but I cannot seem to script this. If I try to read back from the device one character at a time (after sending the AT+CMGS line), I get two blanks then it blocks. If I look on a terminal program, I can see that after I sent the command, there was a carriage return and a line feed, then on the next line was the > and (space) for the prompt. This suggests to me that I am reading the CR and the LF, but it blocks when it tries to read the next line, which has no control characters terminating it (after all, it is a prompts). My question, to anyone who knows the way the serial driver works, is: can I read back from the device a single character, or does the driver only buffer a complete line, defined as being 0 or more characters ending in a control character (or something like that)? My observation seems to be that I can read anything that ends in a control character, but nothing that does not. Thanks for your time, Matthew -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
