Canon TM-355 Online Manual page 428

The printer cannot use a wired LAN connection simultaneously with a Wi-Fi or wireless direct connection.
When connecting another device while the devices are already connected to the printer, connect using a
method other than the above.
Restrictions
Important
• If you connect a device connected to the Internet via a wireless router to the printer that is in the
wireless direct, the connection between the device and wireless router will be disabled. In that case,
the connection of the device may switch to a mobile data connection automatically depending on your
device. Transmission fees for connecting to the Internet using a mobile data connection apply.
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