Seeking BLE Solution for Simultaneous Recording on Multiple Cameras (7+ Devices)

[hfznr]

Hi! Is there an API available to connect and send a start recording command to remote controller? I can only use BLE for my project, and I need to start recording on more than 7 cameras. My computer can send the start command to 7 devices simultaneously. I was considering that if I could access multiple remote controllers, I might be able to start recording on all cameras at the same time. Otherwise, I'll need to use multiple computers, which would be more costly. Alternatively, I could send the start command with a delay, such as waiting 7 seconds before starting recording on the rest without waiting. I am also open to new ideas.