How to implement WeChat printer

How is the printer implemented? do you know the printer? I want to know how the images sent by the user are sent to the client connected to the printer after being uploaded to the server?
Please explain.
Is the client always sending requests to the server?

Reply to discussion (solution)

Generally, you can understand a printer as a network printer. First, you must obtain a license before using this device. The principle is similar to that of a LAN shared printer.

The printer needs to maintain a persistent connection with the server. if the server uses php, you can see workerman. someone uses it as the server to implement the printer.

The printer needs to maintain a persistent connection with the server. if the server uses php, you can see workerman. someone uses it as the server to implement the printer.

Thanks for the information. I will study it. Do you want to write a program on the client connected to the printer to initiate a request to a page on the server and then establish a persistent connection? Can I use the purchased space? Do not require an independent IP address?

The printer needs to maintain a persistent connection with the server. if the server uses php, you can see workerman. someone uses it as the server to implement the printer.

Thanks for the information. I will study it. Do you want to write a program on the client connected to the printer to initiate a request to a page on the server and then establish a persistent connection? Can I use the purchased space? Do not require an independent IP address?

I would like to ask the landlord how the study has taken place? I have been studying this recently, but I am still confused.