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Send data from Server to Client without Collections (with Websocket)


Send data from Server to Client without Collections (with Websocket)

By : N.B.Iresha Madusanka
Date : November 16 2020, 06:23 AM
wish of those help I agree with your findings, DDP RPC is a way for the client to call arbitrary methods on a server, but there's no RPC facility from the server to the client.
A Meteor publication should do what you want, though. You can use the low-level added/changed/removed interface to send arbitrary data to subscribed clients whenever for whatever reason. You probably only have to implement, say added. Let's assume you do this.
code :


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Java: WebSocket server won't send data to client properly

Java: WebSocket server won't send data to client properly


By : Ivailo Papazov
Date : March 29 2020, 07:55 AM
help you fix your problem Some questions:
Do you wait for the connection to open fully before sending from the server? Can you capture the stream using wireshark and see what's actually on the wire? In Chrome's Javascript console do you see any WebSocket related errors? In your onclose handler for the Javascript websocket object, can you console.log the values of code and reason from the event?
code :
ws.onclose = function (e) {
    console.log("closed - code " + e.code + ", reason " + reason);
}
about websocket rfc6455 dataframing and how to send or get message between websocket server and client

about websocket rfc6455 dataframing and how to send or get message between websocket server and client


By : Yorkanauer
Date : March 29 2020, 07:55 AM
Hope this helps The previous format you mention is normally referred to as Hixie-76. You could use this in the short term if you limit yourself to testing against Safari (on both dektop & iOS). (Note that this will only be a short term solution as Safari will be updated in future to use a later, incompatible, protocol version.)
If you want to work against other browsers (e.g. Chrome, Firefox) then you'll need to implement the data framing describe in RFC 6455. There is no way to communicate with these browsers without implementing this data framing.
Websocket client on the ESP8266 doesn't send data to spring-boot server

Websocket client on the ESP8266 doesn't send data to spring-boot server


By : user2838341
Date : March 29 2020, 07:55 AM
will help you Looking to the StompClient library examples SpringStompButtons.ino, we can see the comment :
code :
  if (_sockjs) {
    socketUrl += random(0, 999);
    socketUrl += "/";
    socketUrl += random(0, 999999); // should be a random string, but this works (see )
    socketUrl += "/websocket";
  }
const char* ws_baseurl = "/gs-guide-websocket/"; 
Stomp::StompClient stomper(webSocket, ws_host, ws_port, ws_baseurl, false);
How to send message to WebSocket client from Spring WebSocket server using STOMP?

How to send message to WebSocket client from Spring WebSocket server using STOMP?


By : user3718456
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I found the answer on the official spring documentation.
You just need to inject a SimpMessagingTemplate.
code :
@Controller
public class WebSocketController {

    private SimpMessagingTemplate template;

    @Autowired
    public WebSocketController(SimpMessagingTemplate template) {
        this.template = template;
    }

    @MessageMapping("/alarm")
    @SendTo("/topic/message") 
    public void processMessageFromClient(@Payload String message, Principal principal) throws Exception {

        System.out.println("WEBSOCKET MESSAGE RECEIVED" + message);
    }

    @RequestMapping(value = "/start/{alarmName}", method = RequestMethod.POST)
    public String start(@PathVariable String alarmName) throws Exception {
        System.out.println("Starting " + alarmName);

        this.template.convertAndSend("/topic/message", alarmName);

        return "redirect:/";
    }
}

Could not send data from Server to client via websocket

Could not send data from Server to client via websocket


By : Tim Sweeney
Date : March 29 2020, 07:55 AM
hop of those help? The websocket protocol went through some incompatible changes between early drafts. It looks like your code is split between supporting recent and earlier versions. Handshaking appears based on RFC6455 (or its earlier Hybi drafts); message sending appears to be based on the earlier, incompatible Hixie-76 variant.
It is possible to support multiple protocol variants in your server. Almost all browsers (Safari for Windows being a possible exception) support the more recent variant now though so I presume this is the one you'll want to prioritise.
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