Image counter for each ESP32-CAM swarm image capture

I guess another options is to use your master device to do a Bridge update to each of the devices. You said before that…

but in reality I believe that you can define as many bridges as you wish on your master device, and do consecutive writes to each of them with the same piece of data - the next file number to use.

Multiple bridges are discussed here…

Alternatively, you could do multiple API calls from the master device to update each of the slave devices with the next file number.

Pete.