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I am having issues with the reliability of OP2 as an access point so I would like to run Tinypilot in access point mode, and have OP2 connect to it as a client, but I would also like to be able to access OP2 via Teamviewer on my home network or have internet on OP2 while on the dock. Is it possible to add a usb wifi adapter and connect OP2 as a client to 2 networks?
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yes it's possible, you need a second wifi adaptor
You need special iptable rules if you want to route packets from one network to the other as well as these rules on the clients.
I don't have much confidence in the reliability of network manager and have not had very good results managing multiple adaptors especially if you need specific ones on certain networks, mac spoofing and changing the power levels. You can give it a try, but I use a script that runs wpa_supplicant and dhclient or dhcpcd directly.