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examples/04_multiple_clients.jl

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+# Connect to 3 clients, 1 on the test server of mosquitto and 2 on localhost (requires a broker to run on localhost:1883)
+# We run this only with manual loop execution, as multiple client with threaded network loop are currently not supported.
+# What this script does:
+# The client 1 will subscribe to messages, and every time a message is received in the correct topic test/julia
+# client 2 will publish a message to localhost which is again received by client 3
+
+using Mosquitto
+
+# Connect to a broker, also starts loop if Threads.nthreads()>1
+client1 = Client("test.mosquitto.org", 1883, startloop = false) # will receive message
+client2 = Client("localhost", 1883, startloop = false) # will publish to localhost
+client3 = Client("localhost", 1883, startloop = false) # will receive from localhost
+
+# subscribe to topic different topics for each client
+function subonconnect(c1::Client, c2::Client, c3::Client)
+    # check channel, if there is something todo
+    nmessages = Base.n_avail(get_connect_channel())
+    nmessages == 0 && return 0
+    for i = 1:nmessages
+        conncb = take!(get_connect_channel())
+        if conncb.val == 1
+            println("$(conncb.clientptr): connection successfull")
+            conncb.clientptr == c1.cptr.mosc && subscribe(c1, "test/#")
+            conncb.clientptr == c3.cptr.mosc && subscribe(c3, "julia")
+        elseif conncb.val == 0
+            println("$(conncb.clientptr): disconnected")
+        end
+    end
+    return 0
+end
+
+# What to do if there is a message
+function onmessage(c1, c2)
+    rand()<0.1 && publish(c1, "test/julia", "From client 1"; retain = false)
+    
+    nmessages = Base.n_avail(get_messages_channel())
+    nmessages == 0 && return 0
+    for i = 1:nmessages
+        temp = take!(get_messages_channel())
+        # Do something with the message
+        if temp.topic == "test/julia"
+            println("\ttopic: $(temp.topic)\tmessage:$(String(temp.payload))")
+            publish(c2, "julia", "From client 2"; qos = 2)
+        elseif temp.topic == "julia"
+            println("\ttopic: $(temp.topic)\tmessage:$(String(temp.payload))")
+        else
+            println("Wrong topic :(")
+        end
+    end
+    return 0
+end
+
+# Messages will be put as a Message struct
+# the channel Mosquitto.messages_channel.
+for i = 1:200
+    loop(client1; timeout = 100)
+    loop(client2; timeout = 100)
+    loop(client3; timeout = 100)
+
+    subonconnect(client1, client2, client3)
+    onmessage(client1, client2)
+end
+
+
+# Close everything
+disconnect(client1)
+disconnect(client2)
+disconnect(client3)