You can schedule commands using Macrodroid (android app)

[FBMinis]

Say you want a photo taken every 5min between 7am and 9am, or a video at a specific time of the day.

1. Create a Telegram Channel;
2. Add your cameras to it;
3. Create a Telegram bot and add it to the channel as well;
4. Install Macrodroid and create a Macro using:

Trigger: Date/Regular interval and define your schedule;
Action: Applications/HTTP Request (POST) with the url below modified to include your bot's Token and your Channel's ID.

https://api.telegram.org/bot1234567:abcdefghijklmnopqrstuvwxyz/sendMessage?chat_id=-1234567890&text=/photo

(Change /photo for /clip to get a photo+video)

At the specified time, the bot will post "/photo" in your Channel, the cameras will "read" it and post their photos to their respective chats.

This only works within Channels because, in Groups bots cannot interact between them.

(I use this to capture photos of the sunset and sunrise.)