While setting up a couple of NSA325/320 looked up how to enable power on after power failure and found this thread https://forum.doozan.com/read.php?3,92579,92769#msg-92769 who actually says using the command
$this->bbcode_second_pass_code('', 'i2cset -y 0x0 0x50 0x7 0x01 b')
from i2c-tools package will do the trick:
$this->bbcode_second_pass_quote('', 'a')fter setting this the device always powers on after cable reconnecting no matter if it was on of or before.