I will try to reply to the post from @jakaskerl and @DaniloPejovic. Thanks to you both.
First the good news.
I let my RAE charge over night, and it turned on! I fired up RobotHub and connected to my WiFi network successfully (mostly?). In the 'robots' section of the Hub I can see my RAE, apparently named keembay online, with the "RAE - Default app" installed as the only Perception App.
Selecting keembay, the overview says about half of the RAM is used and almost all of the Disk is used (surprising). The default app is stopped. I can, from my laptop, ping keembay at its iPv4 address.
If I go to the Devices tab, I can see a RAE Device, assigned to nothing (a -), a Status is ready. I can click on the Video Preview button and a very slow and delayed video will play.
In the Perception Apps tab, I can see the default app, with a Status of stopped, and Assigned Devices showing nothing. I am not sure what that means.
Now the bad news.
Selecting the default app brings up another page specific to the app. The title says "Stopped" and "All changes synchronized". The Activity tab says the app was started about 2 hours ago (I've tried many times, but more on that coming). In the "Live View" tab, I see "No streams available."
If I try to Start the app, the title changes from "Stopped" to "Initializing" to "Stopped". There are 4 attempts, and the app then remains "Stopped". At that point the Logs tab repeats the following
[2023-10-27 16:52:15.902] [depthai] [warning] USB protocol not available - If running in a container, make sure that the following is set: "-v /dev/bus/usb:/dev/bus/usb --device-cgroup-rule='c 189:* rmw'"
11:52:17ERROR | on_start:151 => The default app requires an assigned device to run. Please go to RobotHub, navigate to the app's page, click the "Reassign devices" button and select a device.
11:52:17INFO | on_stop:173 => Stopping the app...
I have no clue what the first line means. When I click the "Reassign devices" button, a popup says "You have no available devices to assign to app". I have no idea what is wrong.
I noticed at the end of the "Connect RAE" web page a sentence "RAE also has a special menu for direct control. To access to it: … Copy and paste the <IP of RAE>:9010
into your preferred browser". If I do that with the iPv4 address for my device I see the error message "can't open the page because the server unexpectedly dropped the connection". I have no idea what is wrong or how to fix it.
I should add that I've turned of the RAE several times, restarted RobotHub several times, and I always see what I describe above.
Any additional suggestions?