Not sure what happened, but thanks for taking the time to explain everything again. This is actually extremely helpful . Here is what I know from you:

– device starts and connects to your WIFI router, following your initial SSID+WIFI KEY configuration
– device presents it’s internal webpage , accessible via the LAN IP (this is what we call the router allocated IP in your local network)
– the device reboots

This information tells me the following:
– device connectivity works
– device sensors work (as you saw the data on the internal webpage)
This is consistent with my expectations, as the device was tested prior to being shipped to you. Also since it is a digital device, partial failures are impossible. All device functionality is ok.

The problem:
– the device reboots

The solution:
The problem is caused by the device internal watchdog. This is a special kind of timer, displayed in the local web interface as “WDT” . You will see it gradually increase to a top limit where the reboot happens. The watchdog itself needs to be periodically reset (petting the dog), to prevent it from rebooting.
It’s role is to protect the correct functionality of automated devices and trigger reboots when such hardware is in a deadlock or any other unrecoverable state, to limit human intervention and maintenance.

The reason for why the watchdog is not reset and it eventually reaches the top limit and resets is related to the successful sending of the data. The data simply doesn’t reach the server . The server will not send an acknoledgement . The watchdog will see no successful response and will continue to increase until reboot when the entire things starts over. On the internal webpage you will see a “Stats” field, with the number of succesful data sends / total data sends. First will most likely be 0 in your case.

Why this happens is related to the security settings in your network. You’ll need to connect to your router and rule out anything that might be blocking the A3 communication. A3 sends data by doing simple HTTP Posts, equivalent to a browser opening a webpage. The destination is port 80 on data.uradmonitor.com , make sure your router allows this.
You will also need to do a separate test, where you create a Wifi hotspot on your phone, and have the A3 connected to that, to rule out any other problems created by your main WIFI Router.

Again, your A3 has all its modules operational (sensors + wifi) , yet it keeps on rebooting and the data it sends is blocked.

Waiting for your results!