Android Question How to make p2p connection with B4X?

[bjfhs]

I need transfer video between two device, I have a service with static IP, and the two device connect the internet with router (nat),but not in the same local intranet.
I try to make P2P (UDP) connection,but failed.
1.Client A connect with server ,and tell the server its IP and Port
2. Client B connect with server ,and tell the server its IP and Port
3. Server tell B's IP and Port to A , and A's IP and Port to B
4, Client A send message to B with the B's IP and Port , Client B send message to A with the A's IP and Port

 

[Erel]

You are talking about UDP hole punching. This is a complex feature which depends on the specific network configuration.
I never tried it myself so can't help you with this.

 

[bjfhs]

Yes ,I need UDP hole punching with B4X.

 

[bjfhs]

I need advice or source.

 

[DonManfred]

I need advice or source.

I never saw a full P2P Library here in the Forum... Do you know one?

 

[bjfhs]

I never saw a full P2P Library here in the Forum... Do you know one?

I don't think we can have a P2P Libary,because P2P need a server with static IP,so we need some source code to show how to do.

 

[DonManfred]

I know. That´s why i asked if you know one.

Surely you need a Server. But this is secondary. Not relevant if we do not have any Source.

Try search for a java source for a P2P Client and Server...

 

[KZero]

I need transfer video between two device, I have a service with static IP, and the two device connect the internet with router (nat),but not in the same local intranet.
I try to make P2P (UDP) connection,but failed.
1.Client A connect with server ,and tell the server its IP and Port
2. Client B connect with server ,and tell the server its IP and Port
3. Server tell B's IP and Port to A , and A's IP and Port to B
4, Client A send message to B with the B's IP and Port , Client B send message to A with the A's IP and Port

Theoretically, you can with B4X

but this scenario will work with less than 1% of routers
there are many NAT types and many NAT traversal mechanisms, it's really complicated and even big apps like Skype can't make the p2p connection in every time

if your is to make a video call then use a SIP service Abto VOIP SIP
and if you want to know more about NAT traversal mechanisms read about STUN , TURN and ICE