Be nice to see what the answer is to this, I had exactly the same problem with a Nikon D3200 DSLR.

Using the bleeding edge drivers, Ubuntu Mate, the camera would only take 1s exposures. Anything above, the camera would hang and timeout.

I tried:
Set the camera to bulb mode, with mirror lock off
In Indi, turn 'Force Bulb' mode off.
Entered Sensor resolution, Pixel Pitch settings.

After this, in EKOS setting an exposure of 1s with multiple exposures, the camera ticks away quite happily. above 1s, it hangs on the first exposure and doesn't recover.

Be useful to know if you try the settings above whether you get a different result to me?

In the end, I gave up and switched to using a programmable remote which works fine, but I'd still like to get things working in EKOS if possible...

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