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Got a message back from BI support who helped get this working. Turns out the port (2971) needs to be added to the URL, and ignore/leave the "port" text boxes untouched. This is works:

Thanks for the reply Tony, yes I have. After applying the settings below, the coloured test stripes show up for a minute or so, and then it fails with no signal. VLC and the browser load the stream immediately. What is discovery port doing here? There's nothing listening on port 80 on the...

HI all, I'm running an android app (MQTT Alarm Panel) on a tablet that exposes the tablet's camera as a MJPEG video stream. I can view this stream with a browser by going to http://IP_ADDRESS:2971/camera/stream, and it comes up fine with no authentication, login etc. I can also view this stream...

If you copy the firmware file to the root of the uSD card, called npcupg.bin and boot the camera, it should pickup that there's a new image and flash it.

Yup that's exactly where I got to and then decided against using NTP...I'll get BI to add the timestamp

From memory there was already an NTP client on the rootfs, I needed to setup a local server on my LAN as the camera is blocked from WAN.

OK cool! busybox is on /bin which isn't in the partition that's flashed with npcupg.bin, so I dont think you can replace busybox. You can build a minimal busybox with only the utilities you need, and that should be able to fit on /npc as part of your npcupg.bin image.

Um, I think I ended up using the linux mtd utiliies rather than uboot. @mrxyz's right. the script is probably getting killed once the telnet session is disconnected. Maybe put this script in your /npc/npc script, or call it from there ?

Oh yeah I think I needed to set my VM to bridged network so it was on the same subnet as the camera.

I believe the file on the SD card needs to be named npcupg.bin (not sure I've ever seen this work, can't remember). However - I use a windows utility to do the upgrade : telnetd was always on the original rootfs, it's just not started by default..which we change on our updated /npc/npc...

I run Home Assistant, hence wanting to get MQTT working from the camera so I can trigger automations when the button's pressed. I'm also running Blue Iris and the camera works great with that. Look forward to hearing how you go with the reboot stuff, I think thats the last thing I'd like to...

Alright, worked it out. I'm blocking the camera from WAN access, and it seems sometimes when I press the button there's a blocking function already trying to hit an external IP. So this happens: ** PRESS DOORBELL HERE ** sHiRegCmd.dwBaseAddr = 0x20650000 0x2004 ** SEVERAL SECONDS LATER **...

Yup exactly, do you need an image built with this or do you have access already? I'm almost there on the MQTT side of things, I've got mosquitto_pub running fine on the camera, just having trouble with the named pipe and acting on the "222..". It often takes seconds for the script to pickup...

Deleted.

Well I've successfully managed to corrupt my filesystem, and now npc wont run, either from SD or Flash :) . I should be able to recover by reflashing from uboot, will report back when I've got something useful to share.

I've followed the path described beautifully by @mrxyz (thanks!!), and have managed to patch my npc binary so it doesn't drop the frame rate. I've also managed put this together and build a new firmware image which my device happily accepted and upgraded itself to (I'd rather not have a microSD...