Maybe with an external bistable circuit to handle ON/OFF pin, driven by a GPIO?
If you permanently tie on/off to GND it will be in a constant state of reboot so that wont work. AT+CALA sets up an alarm so you can preset the time it wakes up. So you should set the alarm, shut the module down, the it will wake itself up at the specified time. So set the CALA and then shut the module down, it will wake up again as specified.
OK, I will try.
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