Would a Nano be going to sleep by default? (then missing SoftwareSerial traffic?)

Official Hardware Nano Family Classic Nano
1

I'm using a Nano to read messages coming from a GSM module, and I realized, after sitting a while(may be 20-60 minutes) the Nano quits reading/responding to the messages. But as soon as a Nano input Test button is pressed to send an SMS, the Nano receives the GSM SoftSerial traffic and replies perfectly (until sitting Idle again). I have the UART of the GSM module set to Never sleep.

Does this sound like a Nano thing? I don't recall having this problem using an UNO.

2

No. Must be a problem with the code you didn't post.

3

There are only minor differences between the two.
One is an unbuffered LED on pin 13.
Another one is a weaker 3.3volt pin.
Leo..

4

Looks like this was caused by the old Nano I was using.
It was circa 2013-15 and required the old bootloader. A fresh new Nano seems to have resolved this.
Please excuse the post.

5

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