Android Question JRDC2 with mobile 4G connection

[Rachbob]

Hello everyone,

I made an application with jrdc2 connected to a localhost database. The connection works well when my PC and smartphone are both on wifi. But when i switch my phone to 4G the connection failed.
- what should i do ?
Thanks

 

[josejad]

You have to open ports in your router, and get a dynamic dns address to access it.

you can follow some guide, like

How to Access Your Router Remotely - TechWiser

Want to see what your kids are upto or if you neighbour is stealing your WiFi? Here is a tutorial on how to access Router remotely.

techwiser.com

 

[Rachbob]

I see there are many tasks to do with the router, DNS, windows firewall.. I hope @Erel team can provide a liberary or a class that can handl this job.

Thank you.

 

[Erel]

I hope @Erel team can provide a liberary or a class that can handl this job.

This is not something that can be done with a library or class. Your router must be configured as explained here: https://www.b4x.com/android/forum/threads/37201/#content
And you also need to use a dynamic dns solution.

 

[Bladimir Silva Toro]

Hi @Rachbob

The problem is with the network you want to connect to.

When you connect to your WIFI network, access is local via LAN (Local Area Network) and logically you can access your computer with an IP address (192.168.x.x)

But when you connect to a 3G or 4G network you do so to a WAN (Wide Area Network) and since your computer is not on that network it cannot be accessed. If you need to put your computer on that network, you should talk to your Internet ISP so that it gives you a Public IP that can be accessed from anywhere in the world

If you want to know what your public IP is, click on the following link: https://es.geoipview.com/

With this explanation it should already be clear to you.

 

[Rachbob]

Hi @Rachbob

The problem is with the network you want to connect to.

When you connect to your WIFI network, access is local via LAN (Local Area Network) and logically you can access your computer with an IP address (192.168.x.x)

But when you connect to a 3G or 4G network you do so to a WAN (Wide Area Network) and since your computer is not on that network it cannot be accessed. If you need to put your computer on that network, you should talk to your Internet ISP so that it gives you a Public IP that can be accessed from anywhere in the world

If you want to know what your public IP is, click on the following link: https://es.geoipview.com/

With this explanation it should already be clear to you.

i understand this. i will wait until i finish building my application and i will test it directly into my DB server with a real remote IP. thanks for your help.