Hi there! I want to start off by saying that I think this is a wonderful tool, and I can't wait to get it up and running on my printer!
What is the problem?
I'm trying to connect my Raspberry Pi 2 (maybe that's my problem right there!) running OctoPrint 1.7.3 to a Snapmaker II A350, and when I click on the Connect button, I get the error
"State: Offline after error
No more candidates to test, and no working port/baudrate combination detected."
Everything else works great - the web site is fully functional and very responsive, and the streaming camera works great too.
What did you already try to solve it?
I tried starting it in Safe Mode.
I saw here that it was often a problem with the USB cables, so I tried two different ones. Both are brand new. Neither worked.
I tried all four of the USB ports on the Pi.
I tried using different power cables to the Pi - sometimes I'd also get a low voltage warning, so I kept trying until I got one that didn't give me warning.
All roads are indicating that it's the cables. But they are literally brand new.
Granted, they are no-name cables from Amazon, but still, both of them?
They are both USB-A to USB-A cables since the Snapmaker only has a USB-A port.
These are the only USB-A to USB-A cables I have. I bought them for another project (trying to connect an ancient Seagate GoFlex drive to a computer), and they don't work for that either, but I was chalking that up to how old the drive was.
Is there such a thing as a USB-A / USB-A null modem cable? Might I need one of those instead?
Oh - are you sure that port supports serial connections?
Most of those ports are just for usb drives.
You're right, it's just for a USB drive.
On closer inspection, the printer has two other USB ports: a USB-C that the Snapmaker's original control panel plugs into, and a mini which I'll need to research further.
I'll try plugging the Pi into those two ports and see if either works.