Issue with MQTT Connection OVER websocket - Network Connection Lost Error for iOS Swift

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Dear Solace Community Team,

I’m encountering an issue while trying to connect to the Solace broker over MQTT using CocoaMQTT. Specifically, the connection attempt is being dropped with the error:

Error Domain=NSURLErrorDomain Code=-1005 "The network connection was lost."

The logs indicate that the connection is being lost after initiating the SSL/TLS handshake with the broker at https://mr-connection-cighcgrbttl.messaging.solace.cloud:443/mqtt.

Details:

  • Protocol: wss:// (WebSocket Secure) for port 443, which is the expected secure WebSocket connection.
  • CocoaMQTT Version: [Provide version]
  • Broker URL: https://mr-connection-cighcgrbttl.messaging.solace.cloud:443/mqtt
  • Error Message: The network connection was lost (NSURLErrorDomain Code=-1005).
  • Trust Information: The logs show the trust being received, indicating that SSL handshake is occurring, but the connection still fails.
  • Other Observations:
    • The connection state changes from “connecting” to “disconnected.”
    • The issue persists even after switching networks (tried mobile hotspot and other networks).
    • The connection fails every time at the same point.

iOS swift code :

 let clientID = "CocoaMQTT-\(animal!)-" + String(ProcessInfo().processIdentifier)
            let websocket = CocoaMQTTWebSocket(uri: "/mqtt")
            mqtt = CocoaMQTT(clientID: clientID, host: defaultHost, port: 443, socket: websocket)
            let username = "solace-cloud-client"
            mqtt!.username = username
            mqtt!.password = "oc1h2uejbmurk5r7fjv296v07a"
            mqtt!.willMessage = CocoaMQTTMessage(topic: "topic1", string: "dieout")
            mqtt!.keepAlive = 60
            mqtt!.delegate = self
            mqtt!.enableSSL = true
2

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Looking at the documentation, I can help explain the MQTT over WSS connection issue with CocoaMQTT:

The error occurs because you’re trying to use incorrect ports for MQTT over WebSocket Secure (WSS) connections. Here’s the reasoning:

  1. For Solace Cloud brokers, MQTT connections should use:

    • Port 8883 for MQTT over SSL/TLS (TCPS)
    • Port 8443 for MQTT over WebSocket Secure (WSS)

  2. The ports you’re trying to use (443 and 55443) are actually for:

    • Port 443 - SMF (Solace Message Format) over WSS
    • Port 55443 - SMF over TCPS

  3. When using CocoaMQTT with WebSockets for Solace Cloud, you need to:

    • Use port 8443 for WSS connections
    • Configure the WebSocket URI path as “/mqtt”
    • Enable SSL for secure connections

To resolve the NSURLErrorDomain Code=-1005 error, you should modify your connection settings to use port 8443 for WSS connections to the Solace Cloud broker.

Here are relevant sources for more information:

1 Like
3

Yeah problem resolved. thanks
To extend implementation when I try to subscribe message getting error
UNEXPECTED SUBACK Received: Mismatched counts between topics and granted QoS

granted QoS getting empty for iOS swift

4

I found the solution to fix the issue by publishing the message using the following line:

            mqtt!.publish(topic, withString: message, qos: .qos1, retained: true)