B4J Question send and receive binary with websockets

Discussion in 'B4J Questions' started by narek adonts, May 7, 2019.

  1. narek adonts

    narek adonts Well-Known Member Licensed User

    Hi,

    I am making a mesanging application and I decided to make the backend in b4j.

    I was thinking to using mqtt broker as the server but without some events of the broker it is not possible (authorizations,...)

    And I decided to use jServer with websockets. But it seems that in jServer websockets only support support String to send and receive data.

    Is there a way to send/receive bytes instead of string?

    Narek
     
  2. BillMeyer

    BillMeyer Active Member Licensed User

  3. OliverA

    OliverA Well-Known Member Licensed User

    B4J's jServer WebSocket implementation does not support binary data directly. One way around that would be to Base64 encode the data. Note that jServer has a limit on how much can be transferred at one time via WebSockets (the limit can be changed. See https://www.b4x.com/android/forum/threads/websocket-received-data-exceeds-limit.90678/). You could also use WebSockets for textual communications and regular server handlers for binary transfers (see https://www.b4x.com/android/forum/threads/sending-binary-data-over-websocket.44776/#post-273894).
     
    narek adonts likes this.
  4. narek adonts

    narek adonts Well-Known Member Licensed User

    Thank u. I know this )) I thought that maybe we could add some Java code to add the functionality
     
  5. narek adonts

    narek adonts Well-Known Member Licensed User

    The problem is not only authorization. Some backend work like add to database, notification, ... lot of things must be done. ACL file is not a good solution if the ACL file is too large, so if the users increase it will be an issue
     
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