@zen85 I also see a delay being used. Can you change that to a wait()…?

@zen85 could it be you have an overflow somewhere. You multiply num_leds by another value into an int, perhaps that should be a long

I use a similar board like this (though without the battery) to show the weather forecast for today and traffic information for upcoming routes in our walk-in closet. So I don't have to check the forecast on my phone while dressing.

Is there a typo in your message or in your code?
First you used ReadVcc(), then readVcc()

You should know at what voltage level the ADC tells you 1023. It can be 1,1 but if it is at 1,12 you're already far off with your calculation.
So probably calibrating like mentioned above would be the best.

I have the same issue, using a esp32 mqtt gateway. I'm reading the routing table every now and then, and sometimes completely random nodes appear in it.
I haven't been able to replicate the issue

What is the value you read from the analog port, when the battery is 8.4v? So the value before calculating the voltage.

You mentioned your two resistors, but how they are placed? So which one is connected to gnd and which one to the batteries?

@alowhum said in Auto resend on NACK:

Hardware ACK is just that is reaches the next node in the network, right? It could be a repeater saying "I got something from you". It doesn't 100% guarantee that it reached the controller correctly.

Yes exactly

@alowhum said in Auto resend on NACK:

Software ACK is the controller sending back the exact same message you sent, but this time with the ACK bit set to true? It goes up and down your entire network. It's the best way to be sure that the message reached the controller, since you could theoretically even check if the message details are still the same as when you sent it.

Yes

@alowhum said in Auto resend on NACK:

Both will happen when you set ACK to true in your send() function?

Yes correct again

@alowhum said in Auto resend on NACK:

Is this a correct summary?

I didn't use the software ack myself but I think this last point is also correct.

If you use an ISP programmer, you can reprogram the fuses and use it on lower voltages also. Upto 1.8v but also 3.3v