56 lines
1.8 KiB
Julia
Executable File
56 lines
1.8 KiB
Julia
Executable File
# 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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using Mosquitto
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# Connect to a broker, but dont start network loop.
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# We will trigger the network loop manually here using the loop function
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client = Client("test.mosquitto.org", 1883; startloop = false)
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# subscribe to topic "test" every time the client connects
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function onconnect(c)
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# Check if something happened, else return 0
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nmessages = Base.n_avail(get_connect_channel())
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nmessages == 0 && return 0
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# At this point, a connection or disconnection happened
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for i = 1:nmessages
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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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end
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end
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return nmessages
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end
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function onmessage(mrcount)
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# Check if something happened, else return 0
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nmessages = Base.n_avail(get_messages_channel())
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nmessages == 0 && return 0
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# At this point, a message was received, lets process it
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for i = 1:nmessages
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temp = take!(get_messages_channel())
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println("Message $(mrcount+i):")
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message = String(temp.payload)
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length(message) > 20 && (message = message[1:18]*"...")
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println("\ttopic: $(temp.topic)\tmessage:$(message)")
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end
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return nmessages
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end
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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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mrcount = 0
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while mrcount < 20
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loop(client) # network loop
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onconnect(client) # check for connection/disconnection
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mrcount += onmessage(mrcount) # check for messages
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end
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# Close everything
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disconnect(client) |