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How the WeChat printer is implemented

Source: Internet
Author: User
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How the printer is implemented
Do you know the printer? I would like to know how the user sent the image to the server after sending to the linked printer on the client?
Please explain it to the great God.
Is the client always sending requests to the server?

------to solve the idea----------------------
General printer you can understand that as a network printer first you must obtain permission to use this device principle and LAN shared printer similar
------to solve the idea----------------------
Requires a long connection between the printer and the service side, the service side with PHP can see the Workerman, some people use it as a server to implement the printer

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