Re: Lua, and accessing nodes in /dev/ (Lua in Linux)...

[Matthew Percival <matthew@...>]

G'Day,

> https://robotics.umr.edu:7651/svn/lua/gps.lua
> https://robotics.umr.edu:7651/svn/lua/com.lua

	Thanks a lot for those examples!  They gave me some ideas to try out,
and eventually I got it to work.  I first noticed you had separate in
and out streams: I do not understand why, but when I did that too I was
suddenly able to write --- if someone could point me to something that
would help me to understand this, it would be most appreciated!  Now I
can write, I read back an '\r' (unfortunately); if I pass over this and
read again, I get a response from the modem!  My final code is as below:

	os.execute("stty -F /dev/ttyS0 115200 cread min 0 time 3")

	ttyin = assert(io.open("/dev/ttyS0", "r"))
	ttyout = assert(io.open("/dev/ttyS0", "w"))

	ttyout:write("AT\r")
	ttyout:flush()

	ttyin:flush()
	reply = ttyin:read("*line")

	while (reply == "\r") do
	   ttyin:flush()
	   reply = ttyin:read("*line")
	end

	if (reply ~= "OK\r") then
	   print "Modem Failed!\n"
	else
	   print "Modem OK!\n"
	end

	ttyin:close()
	ttyout:close()

	There is probably a better way to do some of this, but this works at
least.

	Thank you for taking the time to lend me a hand: it has helped me a
great deal!

	-- Matthew