They’ve been around for a while. I used one with a 5D MkII several years ago. Horrible throughput. It was only useful for a quick transfer of a few images. Totally unsuitable for field dumps.
I had good luck with these at my wedding. Instead of disposable cameras, I put cheap digital cameras. It didn't take long for guests to realise that the pictures were appearing on a large tv, in a sideshow. People got a lot more creative when they realised they would be seen quickly, not weeks later.
I managed to get them working without proprietary software, too. The onboard script logged into WiFi and uploaded the photos over ftp.
Given their size and the level of tech at the time, it was pretty impressive.
We also set up an excellent photo booth with the same setup.
A DSLR, on a tripod, a cheap remote trigger, and some photography lamps. We used drapes to box it off a bit. Throw in some inflatable props, and let the kids/drunks make it awesome.
The photos on the TV just encouraged others to join in the fun.
I'd rather just have an ethernet port on the damn printer. You shouldn't have to cludge together basic network device functionality on devices that expensive
If you're interested and can get your hands on some kind of SBC (like a raspberry pi) Klipper has been amazing for my printer. You can also use pretty much any computer but it'll be much less efficient energy wise.
That's another reason why they're kinda dead now. Closeted apps they have to maintain just to keep that garden walled, and it was a cost they decided they also didn't want to spend.
I still have a 4gb Eye-Fi that use just as an SD card to shuttle files out to my laser cutter. I assume the wi-Fi would be horrendously slow and insecure if it worked at all. Was pretty cool when we still had a standalone P&S digital camera though.
Things like this would be so useful in the tinkering community, so many motherboards and such use micro SD cards or USB drives as a primary storage device. Before I gutted my 3d printer and put a computer inside it, I had to schlep the micro SD card back and forth from the printer to the computer room.. being able to send it wireless would've been great. Looked into it at the time but as other have said all the current solutions are dog shit.
Oh I'm way past octoprint and have advanced to klipper, it just would be nice for similar applications, or for people who don't want to set up something similar.
Things like this were huge back in the days of PDAs. They had SDIO ports specifically for expansion. I had one for Wifi and another for Bluetooth on my Garmin PDA, so I couldn't use Bluetooth and Wifi at the same time, and both kept you from having non-volatile storage. If your battery died, your system was wiped because all the storage was in memory.
I got a Dell at the very end of the PDA era (the iPhone was already out, but was still ATT exclusive) that was super fancy because it had a CF card slot AND an SDIO port, so I could store data AND use my SDIO digital camera.
Was it the Axim x50? That was a fine looking PDA. I had an Axim x30 and loved it to death. Its death. Then, I got an IPAQ 210. They didn't have any good accessories for that one. No clip on thumb keyboard or anything.
I don't remember the model at all. I didn't use it very long, as I ended up getting a Blackberry a few months later, and between it and my laptop I really didn't need a PDA.
I used the Garmin iQue m3 for years though, since I had it earlier and it had a pop-out GPS antenna that kept it useful as a navigation tool in the car well into the 2010s.
Still use mine in my cannon point and shoot. (Just as a storage device though) The software support has long ago suckified when "cloud" became all the rage, but it was awesome to sync camera <-> PC without messing with adapters or cables.
Acts as access point, if you connect to it from another device you get access to stuff on the SD card (via app or built-in webserver)... at least in theory. Quality varies.
I still use a 16 gb one for my DSLR. When I bought it about 7 years ago, I opted to get an older entry level canon which was basically better specced than the current (at the time) entry level model and far cheaper. The new model did have wifi though so I got one of these. Works pretty well. And other apps support them not only their included one (PhotoSync on iOS comes to mind). They are slow AF but get the job done.