Fall back to direct TLS on port 5223

Fall back to direct TLS on port 5223 if direct tls is set and no SRV
records are provided.

CHANGELOG.md

@@ -10,6 +10,7 @@
 - Allow JIDs without localpart.
 - Use single quotes for attributes in stanzas created by github.com/beevik/etree (vial etree v1.1.4).
 - Fix SRV lookup when the domain has a CNAME (via xmppsrv v0.2.5).
+- Fall back to directTLS on port 5223 (instead of StartTLS on port 5222) if no SRV records are provided and `-t` is set.
 
 ## [v0.5.6] 2022-11-11
 ### Added

connect.go

@@ -46,13 +46,23 @@ func connect(options xmpp.Options, directTLS bool) (*xmpp.Client, error) {
 				}
 			}
 		}
-		// Try port 5222 if no xmpp-client SRV records are provided.
-		options.NoTLS = true
-		options.StartTLS = true
-		options.Host = net.JoinHostPort(server, "5222")
-		// Connect to server
-		client, err := options.NewClient()
-		return client, err
+		// Try port 5223 if directTLS is set and no xmpp-client SRV records are provided.
+		if directTLS {
+			options.NoTLS = false
+			options.StartTLS = false
+			options.Host = net.JoinHostPort(server, "5223")
+			// Connect to server
+			client, err := options.NewClient()
+			return client, err
+		} else {
+			// Try port 5222 if no xmpp-client SRV records are provided and directTLS is not set.
+			options.NoTLS = true
+			options.StartTLS = true
+			options.Host = net.JoinHostPort(server, "5222")
+			// Connect to server
+			client, err := options.NewClient()
+			return client, err
+		}
 	}
 	// Connect to server
 	client, err := options.NewClient()