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