I've developed Simply Customize It specifically for iOS and have been using my phone, mainly, while developing. That said you can also use it on your iPad and iMac too. Currently a lot of the front end is shared between the devices but if there's interest I can focus on one over the others.

The most common problems include

• Is your reMarkable turned on? Sometimes if you just turned it on it’ll need a minute or two before the connection works.
• Is the host (IP address), username, and password entered correctly? If you used my Fill in the Values button it can sometimes confuse a number or letter especially with the more complicated password. My password, for example, has an l (L) that looks just like a 1 when out of context.
• Is your computer/phone/iPad on the same Wi-Fi as your reMarkable device?
• Was it able to connect before and can't now? There are many reasons your IP address can change such as your if your network is updated or if you moved to another network... maybe go into your reMarkable and check if it's now different.

Right now if it can't connect it catches the error and I use that to determine what message I should show you. If it's an authentication error I start the popup response to you with "Unable to authenticate" while other replies might be more general. If it's a response I haven't seen before I add "Error returned is: error" to the end of the message. If you're having problems connecting and getting this message let me know and I can look into it, hopefully help you out, and add a better message to a future update in the future.

If you're still having issues the best thing I can think of is to use a terminal to try to ssh in and, optionally, using the verbose -v tag for additional information. In this case, on my Mac, I open the terminal and type in: ssh -v root@XXX.XXX.X.XXX. I previously wrote a post about how to connect which has more information than you'd need with the app.

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Feel free to comment on this post or reach out through mail@simplykyra.com.