Hi,
I would like to send data to another smartphone using 4G
I sent data using the internet with httpjob and it works fine,
I sent data using Network + AsyncStreams + B4XSerializator over a wi-fi network and it's great,
But what to do with 4G if you don't know the ip address.
Obviously you could send data via a text message if you know the phone number.
But your question suggests you want more than that.
To 'exchange' data between mobile devices, you need an intermediary (internet site) URL that the device(s) connect to and regularly (as/if it changes) update their current IP address. Simplistically, That site performs the linking of device/user names to IPs.