Hi, not on the same rig; but I normally run two setups on the same network. It requires having them either connected to your network via ethernet or station mode. It doesn’t work well if you are direct connecting. So sounds like you are in good shape there. For obvious reasons only one can control the mount and do guiding. The other could really only run separate camera, focuser, filter wheel.
what you found under the settings for “Switch Device” is how you go back and forth between two ASIAir devices. It works and I frequently use this. One tip, the settings don’t refresh when you switch devices; I logged feedback/bug but it hasn’t been fixed as of yet. So for a specific example, if you are looking at power output, then switch devices, the power output is going to show the prior device, not the current. Similar thing for other settings like in EAF, the backlash doesn’t update to the newly selected device, it retains the old devices backlash. Now I’m fair certain that these issues are only with how the iOS app displays the values (incorrectly); but on the actual ASIAir device it still has the correct value. I believe this because if you leave the settings all together, then go back into settings you will see the correct values display for the current device. So that’s the tip/workaround. If something looks off, I on occasion kill the app and relaunch.
not sure if that answered your question, the part that’s confusing me is you are saying “same rig” but also saying you want different targets of planetary & DSO - so I don’t know how it’s possible to point at two different targets at the same time. If you are talking about not doing it at the same time, but switching back and forth - then you wouldn’t use 2 ASIAir devices, you would just get a USB switch and connect the second camera to it. Then in the app you would just turn off camera A for planetary, then turn on camera B for DSO. Repeat if you have other devices. I don’t think there’s a limit on how many devices you can connect - I would guess with a USB hub you should be able to get 3x cameras, 2x filter wheels, 2x focusers, 2x storage. You may want to get two USB hubs to balance the load instead of all fighting for bandwidth on one port.
Maybe that last paragraph rah touched on what you are trying to do? Share some more details on what you are thinking.