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examples/03_subscribe_onconnect_threaded.jl

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+# Read 20 messages in topic "test/..." from the public broker test.mosquitto.org
+# Different from example 02, the client will resubscribe to its topic every time it connects to the broker
+# This example assumes julia was started with >1 thread
+# e.g., julia -t 2 subscribe.jl
+if Threads.nthreads()<2 
+    println("Start julia using atleast 2 threads to run this example:")
+    println("julia -t 2 subscribe.jl")
+    exit(1)
+end
+
+using Mosquitto
+
+# Connect to a broker, also starts loop if Threads.nthreads()>1
+client = Client("test.mosquitto.org", 1883)
+
+# subscribe to topic "test" every time the client connects
+function subonconnect(c)
+    while true
+        conncb = take!(get_connect_channel())
+        if conncb.val == 1
+            println("Connection of client $(conncb.clientptr) successfull, subscribing to test/#")
+            subscribe(c, "test/#")
+        elseif conncb.val == 0
+            println("Client $(conncb.clientptr) disconnected")
+        else
+            println("Subonconnect function returning")
+            return 0
+        end
+    end
+end
+Threads.@spawn subonconnect(client)
+
+# Messages will be put as a tuple in
+# the channel Mosquitto.messages_channel.
+for i = 1:50
+    # Take the message on arrival
+    temp = take!(get_messages_channel())
+    # Do something with the message
+    println("Message $i of 50:")
+    message = String(temp.payload)
+    length(message) > 15 && (message = message[1:13]*"...")
+    println("\ttopic: $(temp.topic)\tmessage:$(message)")
+end
+
+# Close everything
+put!(Mosquitto.connect_channel, Mosquitto.ConnectionCB(Ptr{Mosquitto.Cmosquitto}(C_NULL), UInt8(255), 0))
+disconnect(client)