I have a php file which is called by a website:
Within the php I write a log file where I can see which string v I received (W100 in this case).
The webserver is hosted on a Raspberry Pi and should send this data to the uart.
The files locations:
/SCRIPTS/serial_tx.php /SCRIPTS/c/jmsend/serial_tx // the executable, compiled from a C script
If I am in the root of the webserver and, from the console of my Pi, I run
sudo /var/www/html/SCRIPTS/c/jmsend/serial_tx W100
I get the command sent correctly.
With the php file I tried with system, shell_exec and exec without success.
shell_exec("sudo /var/www/html/SCRIPTS/c/jmsend/serial_tx ".$ric);
$ric is the received command.
I tried with different path settings too (starting from Pi root or webserver root).
All the files have a 777 as permissions.