I recently had an inverter. Ever since then, I have not been able to use GivTcp to set the overnight charge. Someone has suggested that there may be a problem because the serial number of the inverter has not changed?
If the serial number hasn't changed, how about the IP address of the dongle? Could that have changed?
Maybe a question for @stevelewis ? Think he wrote that app?
The settings include the IP address and the serial number
If either of these change, you'll need to update the GivTCP settings
(The s/no is stored in the inverter registers, and GivTCP checks this against your settings)