Guys, let me give you some advice:
- You should consider using HTTP API for sending data to Blynk cloud, when you only need send data from hardware.
In this case you can sleep as much as you need, collect data, and than even “bulk data upload” API is available, if you don’t want to connect to network EVERY time! - It you want to control the thing, there are multiple options:
- Best of all, use Bluetooth LE for direct connection.
You’ll have to carefully pick hardware and controller, so it can sleep correctly. - If you still want to use cloud, then use normal Blynk library or HTTP API, but in this scenario:
Connect
Use sync API to get values update
Disconnect and sleep for some time
Restart from beginning (or restart controller)
In most cases, low power modes are very tricky to get right, and should be considered implementing mostly for commercial applications, or by very experienced hobbyists 