[mh] Returning 0 as a value and not false?

I’ve been testing out the power monitoring on the tasmota module with good success. It’s nice to see an RRD as well to profile a few devices.

I’ve run into a snag though, that I think is easy but the solution is eluding me. To allow for monitoring power changes, I have a power_changed method. each time new power data comes in, I compare the new value to the old one, and if they are different, $self->{power_state_changed} is set to that value. This works great _except_ for 0 values. 0 can be a valid state (and in fact I need to see it to determine if something is turned off), however 0 is being interpreted as false, so the power_changed method is never set.

Does anyone have any suggestions on how to pass along a 0 value so the method will work? I thought maybe returning 0.0 as a 0 might work, but that seems like a kludge.

--
sub reset_power_state {
    my ($self) = @_;
        if ($self->{power_state_changed}) {
            if ($self->{power_state_changed_loop}) { #wait for a loop to reset power_state_changed
                undef $self->{power_state_changed};
                $self->{power_state_changed_loop} = 0;
            } else {
                $self->{power_state_changed_loop} = 1;
            }
        }
}


sub update_power {
    my ($self,$power, $current) = @_;
    $self->{monitor}->{prevpower} = $self->{monitor}->{power};
    $self->{monitor}->{power} = $power;
    $self->{monitor}->{maxpower} = $power if ($self->{monitor}->{power} > $self->{monitor}->{maxpower});
    $self->{power_state_changed} = $power unless ($self->{monitor}->{prevpower} == $self->{monitor}->{power});
    $self->{monitor}->{prevcurrent} = $self->{monitor}->{current};
    $self->{monitor}->{current} = $current;    
    $self->{monitor}->{maxcurrent} = $current if ($self->{monitor}->{current} > $self->{monitor}->{maxcurrent});
}


sub power_changed {
    my ($self) = @_;
    return $self->{power_state_changed};



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