Difference between revisions of "Print from pi"

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Printing from a RaspberryPi to a line printer (dot matrix, receipt printer) can be done quite simply, by simply writing the text to printer using:
Printing from a RaspberryPi to a line printer (dot matrix, receipt printer) can be done quite simply, by simply writing the text to printer using:  
 
  echo "hello printer" > /dev/usb/lp0
  echo "hello printer" > /dev/usb/lp0
Where:
Where:
* <code>/dev/usb/lp0</code> is the location of the printer
* <code>/dev/usb/lp0</code> is the location of the printer
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Sara wants to expand this mechanism, to have ePub's hyperlinks to make the printer print the words under the hyperlink.
Sara wants to expand this mechanism, to have ePub's hyperlinks to make the printer print the words under the hyperlink.


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* the server side receives the words and '''writes''' it to the Pi   
* the server side receives the words and '''writes''' it to the Pi   


===How does server writes to the Pi ?===
==How does server writes to the Pi ?==
* a reverse ssh tunnel that allows the server to login Pi. http://www.thegeekstuff.com/2013/11/reverse-ssh-tunnel
* set a '''reverse ssh tunnel''' that allows the logging in to Pi from remote server. http://www.thegeekstuff.com/2013/11/reverse-ssh-tunnel
* server runs print command over ssh. eg. <code>ssh user1@server1 'df -H'</code> <code>ssh user1@server1 'echo "hello printer" > /dev/usb/lp0'</code>
** use ssh keys to avoid password requests.
** ensure that '''when Pi boots the ssh tunnel is started''', by making it into a service http://blog.scphillips.com/posts/2013/07/getting-a-python-script-to-run-in-the-background-as-a-service-on-boot/
* server runs print command over ssh. eg. <code>ssh user1@server1 'df -H'</code> <code>ssh user1@server1 'echo "hello printer" > /dev/usb/lp0'</code> ssh pi.sara 'echo "my sentence" > /root/foo'
 
 
==How to to run commands on server from ebook?==
* ebook links to cgi script
** ideally the word wrapped in book would be sent to cgi
** cgi scripts runs command on server, addressed to Pi




[[Category:Research]]
[[Category:Research]]

Latest revision as of 09:35, 2 June 2016

Printing from a RaspberryPi to a line printer (dot matrix, receipt printer) can be done quite simply, by simply writing the text to printer using:

echo "hello printer" > /dev/usb/lp0

Where:

  • /dev/usb/lp0 is the location of the printer
  • > is a write to command

Sara wants to expand this mechanism, to have ePub's hyperlinks to make the printer print the words under the hyperlink.

In order to do so, a possible plan:

  • have words in epub under hyperlink pointing towards a server-side script
  • the server side receives the words and writes it to the Pi

How does server writes to the Pi ?


How to to run commands on server from ebook?

  • ebook links to cgi script
    • ideally the word wrapped in book would be sent to cgi
    • cgi scripts runs command on server, addressed to Pi