not the goal setup but the way I tried it out - a webpage to send an
sms to mobile phone. This is an php what calls a python script. A
python script opens serial device, checks for gsm network, sends a
message - on all the way I try to make sure that appropriate answers
are received from the gsm device so that I know that all is going well
(and if not - cancel it with error message).
Testing it with sending an sms from two open webpages, I normally got
that one message was sent and for the other I received "try once more,
happened that and that". But I got also an inadmissible situation -
the received sms contained also unwanted text. As far as I can realize
how to deal with it is not allowing writing to the device for two
processes simultaneously.
Andra
On 19 Marts, 11:00, taco <trala...@joepie.nlwrote:
kkadr...@gmail.com wrote:
hello group,
how to get ttyS0 serial port for exclusive access? I have a python
script that uses this device with AT commands. I need that two
instances can call simultaneosuly this python script but only one of
them gets the device. I tried fcntl.flock, it was just ignored, put
writtable file LCK..ttyS0 in /var/lock, tried ioctl (but I may not
know what are appropriate arguments), googled half a day for various
phrases, error messages etc....without success.
please help,
Andra
not sure if I understand you well, but how about a server application which
accepts 2 clients which can send messages which are output on the serial
device? The serial device access protected with a mutex while receiving
messages done in 2 threads or something.
taco