waitForResponse option always results on Socket timeout error

[gkourpa]

Hi all, I've been using the library with an EPSON TM-T20III thermal printer and I'm having an issue when printing over the network with the waitForResponse option set to true.

The printer prints out everything normally, but then I'm always getting a Socket timeout error (even if I set the timeout very large), which means that the networkConnection.on('data', handler) never gets executed.

I've currently implemented a workaround (I basically wait for some time according to the buffer size before marking the print job as complete), but I would definetely like to have a more robust and less hacky approach to this.