Send device sensor data to external http server

[matc1]

Hi, I'm just getting started with your phyphox App.

I have a question: 

i created a test experiment and i inserted the following "lines" in phyphox  configuration file to receive data from the device spontaneously to an external web server:

<network>
<connection id="gps_stream" service="http/post" address="https://www.testdemo.com/" interval="15">
<send id="accX" type="buffer" datatype="number" keep="false">accX</send>
<send id="accY" type="buffer" datatype="number" keep="false">accY</send>
<send id="accZ" type="buffer" datatype="number" keep="false">accZ</send>
<send id="acc" type="buffer" datatype="number" keep="false">acc</send>
</connection>
</network>

It works perfectly. I receive data on my exposed web site.

My problem is that if I replace address="https://www.testdemo.com/" with an internal network address I get a connection error from the "phyphox" application.

Example address="http//10.1.1.100/" (the mobile is in the same network and has ip 10.1.1.202)

Is there any limitation to the use of internal network addresses on the phyphox application side? 

I use an iPhone 13 on which I installed phyphox. 

Thank you.