Read port never get response on Windows

[jaysongyn]

$serial->deviceSet("COM2"); $serial->confBaudRate(115200); $serial->deviceOpen(); $serial->sendMessage("AT+CMGF=1\n\r"); $serial->sendMessage("AT+cmgs=\"6299999999\"\n\r"); $serial->sendMessage("test \n\r"); $serial->sendMessage(chr(26)); sleep(7); var_dump($serial->readPort());

[kamaroly]

Did you find a solution for this ?

[jaysongyn]

@kamaroly They have comment on the code " // Windows port reading procedures still buggy" When I try to read I never get awnser. What I did instead using
do { if ($i > $count) { $content .= fread($this->_dHandle, ($count - $i)); } else { $content .= fread($this->_dHandle, 128); } } while (($i += 128) === strlen($content));
`

$content = fread($this->_dHandle,56);
`
I set length to 56.

This is not the best solution, because if you have response bigger than 56 length you can't read, but it solve my problem.

To test if my device is working and connect to com port I use PUTTY.

[ttk]

I've done some testing under Windows and I can confidently say that using the built-in PHP file system functions such as: fread and fgets are unreliable when dealing with the COM port. In some cases, it worked when the COM port was opened and closed by another program (such as putty or a serial monitor). In most cases, it would simply not read any data (most likely it's buffering internally).

The proper way to communicate with the COM port on Windows is to use the Direct IO functions. This is an extension you need to install first, before you can use it. Unfortunately I couldn't find a serial php library that uses the Direct IO API. Instead I just used the API directly.

For more info, see the discussion on StackOverflow.