Hello!
Would like to connect it to a Asus Router, so I can connect to the Raspberry Pi from my computer that has a wired connection.
Would you like guidance on installing OpenWRT first?
Your desired topology is not quite clear.
WRT1900AC is generally understood as "Linksys WRT1900AC v1 (mamba)" or "Linksys WRT1900AC v2 (cobra)" (which of those doesn't change the rest materially though, but I'd still need confirmation if we're talking about either of these and not some unknown other device), so I'm not sure how ASUS (which model, exactly - and does it already run OpenWrt) integrates into this.
That out of the way, mwlwifi is not exactly great (fullstop), but even worse if you want to use it in client (let alone 4addr or other forms of AP/STA uses), so this hardware is not a great solution (in plain client usage, the RPi's internal WLAN might be 'good enough' (even if not great)).
Please describe your desired a usage scenario - the networking topology and function you expect the wrt1900ac to cover a bit more detailed, a quickly drawn topology diagram might be helpful as well.
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Seems workable, openwrt as a dumb ap and a switch connevting asus to rpi?
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To start. There's "possible" and then there's whether it's the best compromise we can help you come up with. We could certainly put Linksys as a a"client" or "wireless extender" type setup.
Depending on how that's done it can complicate access from your PC or add a whole lot of configuration for not much gain?
Parroting the above response but how fast do you need the FTP? I reckon built in wifi will be fine if it's close.
I guess SSH if latency is high/variable can be annoying when typing?
IMO for development or can you use a cable / flash drive when you need to do big files?
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Contrary to the others, I'm not quite as positive about the diagram above. ASUSwrt-Merlin rules out the WDS/4addr route (which would be ideal), leaving you only with relayd (which is not ideal, doesn't support IPv6 and is generally a tad unreliable). In both of these cases, the WRT1900ACv2 would have to act as client (STA) to the ASUS router, which is a mode of operation mwlwifi is not good at (the firmware is not designed for this), while you can try, I'm not too hopeful here.
The integrated WLAN of the RPi is neither great, nor long range, nor fast, but it may actually behave better for this use case, than the WRT1900AC - if not, a ~10 buck mt7921au USB stick might just fill the gap (better).
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Thanks. Yeah to clarify. I was trying to point out that "possible" and "good idea" per your comment about mwlwifi are two different things.
editt:
And yeah, raspberry pi wifi over long range sucks. But I only know raspi 3 and earlier.... But you can only do so much with a cheap chip antenna =P
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