Nanopi-R4S - OpenWRT - How to use RTC ?

[Sergio]

Hello,
How can I use RTCWake to put the system into Suspend Mode and set a Wake Time ?
I could not fin any cli command to do this.
Any tips or suggestions would be appreciated.
Thanks

[sandragin]

Hello,
You can specify the wake time in seconds from the current time or in a specific timestamp.

Example Command
To suspend the system for a specific duration (e.g., 1 hour) and wake it up, you can use:

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sudo rtcwake -m suspend -l -s 3600

This command will suspend the system for 3600 seconds (1 hour).

Example with Specific Time
If you want to set a specific wake-up time, you can convert your desired wake time into a Unix timestamp. For example:

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sudo rtcwake -m suspend -l -t $(date +%s -d '2025-07-03 10:00:00')

Replace 2025-07-03 10:00:00 with your desired date and time.

[ustycelebra]

The -s option is great for quick tests, but I think I’ll stick with the -t timestamp method for daily scheduling. I’ve had trouble before when trying to calculate the exact duration, so having an absolute time is easier for me.