B4J Question send and receive binary with websockets

narek adonts · May 7, 2019

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

BillMeyer · May 7, 2019

Maybe rethink the MQTT option. If you install your own Mosquitto broker and read the following article - it might just help

http://www.steves-internet-guide.com/topic-restriction-mosquitto-configuration/

OliverA · May 7, 2019

narek adonts said:
Is there a way to send/receive bytes instead of string?

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 · May 8, 2019

OliverA said:
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).

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

narek adonts · May 8, 2019

OliverA said:
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).

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

B4J Question send and receive binary with websockets

narek adonts

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BillMeyer

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OliverA

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narek adonts

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narek adonts

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B4J Question send and receive binary with websockets

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