Android Question ZeroMQ wrapping on B4A

[Noffe]

Hello, i find zmq librairy very powerfull networking lib, i found pure java code binding, but failed to wrap for B4A
can someone help??

Link for java binding download: https://codeload.github.com/zeromq/jeromq/zip/v0.5.1

 

[DonManfred]

For what you need a second nezworking library?

 

[Noffe]

Thanks, i need a pub/sub messaging system real time, reliable that can handle connections lost transparently
b4a websockets looks not so efficient for connection lost detection.
And ZMQ is TCP and More i think.

 

[Noffe]

For what you need a second nezworking library?

Thanks, i need a pub/sub messaging system real time, reliable that can handle connections lost transparently
b4a websockets looks not so efficient for connection lost detection.
And ZMQ is TCP and More i think.

 

[Brandsum]

Have a look at: https://www.b4x.com/android/forum/threads/socket-io-client-library.99730/

 

[Noffe]

Have a look at: https://www.b4x.com/android/forum/threads/socket-io-client-library.99730/

Thanks,i give a try and let you know
is it raw TCP or Just HTTP/HTTPS ?
Regards

 

[Brandsum]

Not sure but I think the connection protocol depends upon the server type. And you can create a TCP server instead of HTTP server in NodeJS.

Example: https://gist.github.com/maripiyoko/4874e67ed9f8e8b20130

 

[OliverA]

is it raw TCP or Just HTTP/HTTPS ?

HTTP/HTTPS. Socket.io uses WebSockets (when available) for communications. Please note Socket.io preferred communication channel is WebSockets, but if a browser does not have it (back then, many did not), then Sockiet.io provides alternative ways to communicate (over HTTP).

handle connections lost transparently

What would you like WebSockets to do in this case that it does not now?

b4a websockets looks not so efficient for connection lost detection

How is it inefficient?

 

[Noffe]

Thanks OliverA, socket.io will not help. since its websocket based or http
I need something more low level, as TCP/IP or UDP
I want to build a lightweight RELIABLE communication messaging to interconnect, multiples b4a app, either directly by UDP or via a TCP server without broker (most of them dont use websocket, but MQTT)
ZeroMQ looks fine, i implemented it on server side, but not succeded on B4A side
Regards

 

[Noffe]

How is it inefficient?

websocket is on top of HTTP, which is on top of TCP
Network failure makes a big latency (up to 20 sec or more ) before it triggers disconnec or error event
During this time, you keep sending and losing messages
Regards

 

[OliverA]

without broker

Which of the models pointed out in the following link will you be using? http://zeromq.org/whitepapers:brokerless. If you are thinking about going fully broker-less (even without Directory Services), why not just use AsyncStreams to communicate?

 

[Noffe]

Which of the models pointed out in the following link will you be using? http://zeromq.org/whitepapers:brokerless. If you are thinking about going fully broker-less (even without Directory Services), why not just use AsyncStreams to communicate?

It will look like a server as a Directory of Service to manage connecting apps data: IPs and PORTs
And the app will send directly UDP frame to the final app with those informations

Plan to use Network library

1) Yes i am trying to use Network lib and AsyncStreams but i lack zeroMQ STREAM wire format documentation to implement.
2) I thougt UDP can fit.

 

[Brandsum]

If you want to use low level UDP connection the you can use DatagramSocket.

Create a server which will listen for packets and a client which will send packets.

 

[OliverA]

I thougt UDP can fit.

I want to build a lightweight RELIABLE communication messaging to interconnect,

UDP <> reliable
If you want to make UDP reliable, be prepared to write some code, which will nullify your lightweight goal.
Have you seen this? https://www.b4x.com/android/forum/threads/mqtt-chat-with-auto-discovery.75713/#content