[{"data":1,"prerenderedAt":667},["ShallowReactive",2],{"node-red-\u002Fnode-red\u002Fcore-nodes\u002Fmqtt-in":3},{"id":4,"title":5,"body":6,"description":16,"extension":661,"meta":662,"navigation":330,"path":663,"seo":664,"stem":665,"__hash__":666},"nodeRed\u002Fnode-red\u002Fcore-nodes\u002Fmqtt-in.md","Node-RED - MQTT In Node",{"type":7,"value":8,"toc":647},"minimark",[9,14,21,25,30,35,38,42,45,62,66,69,80,83,87,90,146,150,153,157,160,184,605,609,619,624,628,639,643],[10,11,13],"h1",{"id":12},"mqtt-in","MQTT In",[10,15,17],{"id":16},"",[18,19],"binding",{"value":20},"meta.title",[22,23,24],"p",{},"This node connects to an MQTT broker and subscribes to messages from a specified topic.",[26,27,29],"h2",{"id":28},"configuration-options","Configuration Options",[31,32,34],"h3",{"id":33},"server-configuration","Server Configuration",[22,36,37],{},"The MQTT server is automatically configured and managed by FlowFuse. When this node is added to the canvas, a corresponding MQTT broker client is created automatically. The connection settings are handled internally, requiring no manual configuration.",[31,39,41],{"id":40},"topic","Topic",[22,43,44],{},"Defines the topic to subscribe to. The topic can include MQTT wildcards:",[46,47,48,56],"ul",{},[49,50,51,55],"li",{},[52,53,54],"code",{},"+"," for a single-level wildcard",[49,57,58,61],{},[52,59,60],{},"#"," for a multi-level wildcard",[31,63,65],{"id":64},"qos-quality-of-service","QoS (Quality of Service)",[22,67,68],{},"Specifies the message delivery guarantee level:",[46,70,71,74,77],{},[49,72,73],{},"0: Fire and forget",[49,75,76],{},"1: At least once",[49,78,79],{},"2: Once and once only (default)",[22,81,82],{},"If not defined, the default value is 0.",[26,84,86],{"id":85},"output-properties","Output Properties",[22,88,89],{},"When a message is received, the node outputs the following properties:",[46,91,92,98,104,110,116,122,128,134,140],{},[49,93,94,97],{},[52,95,96],{},"msg.payload",": The message content. Strings are passed as-is, and binary data is output as a Buffer.",[49,99,100,103],{},[52,101,102],{},"msg.topic",": The topic on which the message was received.",[49,105,106,109],{},[52,107,108],{},"msg.qos",": The QoS level of the received message.",[49,111,112,115],{},[52,113,114],{},"msg.retain",": True if the message was retained on the broker.",[49,117,118,121],{},[52,119,120],{},"msg.responseTopic",": MQTTv5 response topic.",[49,123,124,127],{},[52,125,126],{},"msg.correlationData",": MQTTv5 correlation data.",[49,129,130,133],{},[52,131,132],{},"msg.contentType",": MQTTv5 content type of the payload.",[49,135,136,139],{},[52,137,138],{},"msg.userProperties",": MQTTv5 user properties.",[49,141,142,145],{},[52,143,144],{},"msg.messageExpiryInterval",": MQTTv5 message expiry time in seconds.",[26,147,149],{"id":148},"dynamic-subscription-control","Dynamic Subscription Control",[22,151,152],{},"The MQTT In node can be configured to dynamically manage connections and topic subscriptions. When this feature is enabled, the node accepts control messages through its input.",[31,154,156],{"id":155},"input-properties","Input Properties",[22,158,159],{},"These inputs only apply when dynamic subscriptions are enabled:",[22,161,162,165,166,169,170,169,173,169,176,179,180,183],{},[52,163,164],{},"msg.action",": Defines the action to perform. Supported actions include:\n",[52,167,168],{},"\"connect\"",", ",[52,171,172],{},"\"disconnect\"",[52,174,175],{},"\"getSubscriptions\"",[52,177,178],{},"\"subscribe\"",", and ",[52,181,182],{},"\"unsubscribe\"",".",[46,185,186,241,552],{},[49,187,188,189,169,191,194,195,233,236,237,240],{},"For ",[52,190,168],{},[52,192,193],{},"msg.broker"," this can override broker configuration properties such as:",[46,196,197,202,207,213,218,223,228],{},[49,198,199],{},[52,200,201],{},"broker",[49,203,204],{},[52,205,206],{},"port",[49,208,209,212],{},[52,210,211],{},"url"," (overrides broker and port)",[49,214,215],{},[52,216,217],{},"username",[49,219,220],{},[52,221,222],{},"password",[49,224,225],{},[52,226,227],{},"clientid",[49,229,230],{},[52,231,232],{},"cleansession",[234,235],"br",{},"If a broker is already connected, an error is logged unless ",[52,238,239],{},"force"," is specified. In that case, the node disconnects, applies the new settings, and reconnects with the updated configuration.",[49,242,188,243,245,246,169,248,250,251],{},[52,244,178],{}," or ",[52,247,182],{},[52,249,102],{}," specifies the target topic(s). This can be:",[46,252,253,256,266],{},[49,254,255],{},"A string containing a single topic filter.",[49,257,258,259,261,262,265],{},"An object containing ",[52,260,40],{}," and ",[52,263,264],{},"qos"," properties.",[49,267,268,269,274,276,277,481,485,487,488],{},"An array of strings or objects for multiple topics.",[270,271,273],"h4",{"id":272},"subscribe","Subscribe",[234,275],{},"Subscribes to one or more topics.",[278,279,283],"pre",{"className":280,"code":281,"language":282,"meta":16,"style":16},"language-javascript shiki shiki-themes github-light github-dark","\u002F\u002F Single topic\nmsg.action = 'subscribe';\nmsg.topic = 'sensors\u002Ftemperature';\n\n\u002F\u002F Single topic with QoS\nmsg.action = 'subscribe';\nmsg.topic = { topic: 'sensors\u002Ftemperature', qos: 1 };\n\n\u002F\u002F Multiple topics\nmsg.action = 'subscribe';\nmsg.topic = ['sensors\u002Ftemperature', 'sensors\u002Fhumidity'];\n\n\u002F\u002F Multiple topics with QoS\nmsg.action = 'subscribe';\nmsg.topic = [\n  { topic: 'sensors\u002Ftemperature', qos: 1 },\n  { topic: 'sensors\u002Fhumidity', qos: 2 }\n];\n","javascript",[52,284,285,294,312,325,332,338,349,372,377,383,394,414,419,425,436,446,461,476],{"__ignoreMap":16},[286,287,290],"span",{"class":288,"line":289},"line",1,[286,291,293],{"class":292},"sJ8bj","\u002F\u002F Single topic\n",[286,295,297,301,305,309],{"class":288,"line":296},2,[286,298,300],{"class":299},"sVt8B","msg.action ",[286,302,304],{"class":303},"szBVR","=",[286,306,308],{"class":307},"sZZnC"," 'subscribe'",[286,310,311],{"class":299},";\n",[286,313,315,318,320,323],{"class":288,"line":314},3,[286,316,317],{"class":299},"msg.topic ",[286,319,304],{"class":303},[286,321,322],{"class":307}," 'sensors\u002Ftemperature'",[286,324,311],{"class":299},[286,326,328],{"class":288,"line":327},4,[286,329,331],{"emptyLinePlaceholder":330},true,"\n",[286,333,335],{"class":288,"line":334},5,[286,336,337],{"class":292},"\u002F\u002F Single topic with QoS\n",[286,339,341,343,345,347],{"class":288,"line":340},6,[286,342,300],{"class":299},[286,344,304],{"class":303},[286,346,308],{"class":307},[286,348,311],{"class":299},[286,350,352,354,356,359,362,365,369],{"class":288,"line":351},7,[286,353,317],{"class":299},[286,355,304],{"class":303},[286,357,358],{"class":299}," { topic: ",[286,360,361],{"class":307},"'sensors\u002Ftemperature'",[286,363,364],{"class":299},", qos: ",[286,366,368],{"class":367},"sj4cs","1",[286,370,371],{"class":299}," };\n",[286,373,375],{"class":288,"line":374},8,[286,376,331],{"emptyLinePlaceholder":330},[286,378,380],{"class":288,"line":379},9,[286,381,382],{"class":292},"\u002F\u002F Multiple topics\n",[286,384,386,388,390,392],{"class":288,"line":385},10,[286,387,300],{"class":299},[286,389,304],{"class":303},[286,391,308],{"class":307},[286,393,311],{"class":299},[286,395,397,399,401,404,406,408,411],{"class":288,"line":396},11,[286,398,317],{"class":299},[286,400,304],{"class":303},[286,402,403],{"class":299}," [",[286,405,361],{"class":307},[286,407,169],{"class":299},[286,409,410],{"class":307},"'sensors\u002Fhumidity'",[286,412,413],{"class":299},"];\n",[286,415,417],{"class":288,"line":416},12,[286,418,331],{"emptyLinePlaceholder":330},[286,420,422],{"class":288,"line":421},13,[286,423,424],{"class":292},"\u002F\u002F Multiple topics with QoS\n",[286,426,428,430,432,434],{"class":288,"line":427},14,[286,429,300],{"class":299},[286,431,304],{"class":303},[286,433,308],{"class":307},[286,435,311],{"class":299},[286,437,439,441,443],{"class":288,"line":438},15,[286,440,317],{"class":299},[286,442,304],{"class":303},[286,444,445],{"class":299}," [\n",[286,447,449,452,454,456,458],{"class":288,"line":448},16,[286,450,451],{"class":299},"  { topic: ",[286,453,361],{"class":307},[286,455,364],{"class":299},[286,457,368],{"class":367},[286,459,460],{"class":299}," },\n",[286,462,464,466,468,470,473],{"class":288,"line":463},17,[286,465,451],{"class":299},[286,467,410],{"class":307},[286,469,364],{"class":299},[286,471,472],{"class":367},"2",[286,474,475],{"class":299}," }\n",[286,477,479],{"class":288,"line":478},18,[286,480,413],{"class":299},[270,482,484],{"id":483},"unsubscribe","Unsubscribe",[234,486],{},"Removes subscriptions from one or more topics.",[278,489,491],{"className":280,"code":490,"language":282,"meta":16,"style":16},"\u002F\u002F Single topic\nmsg.action = 'unsubscribe';\nmsg.topic = 'sensors\u002Ftemperature';\n\n\u002F\u002F Multiple topics\nmsg.action = 'unsubscribe';\nmsg.topic = ['sensors\u002Ftemperature', 'sensors\u002Fhumidity'];\n",[52,492,493,497,508,518,522,526,536],{"__ignoreMap":16},[286,494,495],{"class":288,"line":289},[286,496,293],{"class":292},[286,498,499,501,503,506],{"class":288,"line":296},[286,500,300],{"class":299},[286,502,304],{"class":303},[286,504,505],{"class":307}," 'unsubscribe'",[286,507,311],{"class":299},[286,509,510,512,514,516],{"class":288,"line":314},[286,511,317],{"class":299},[286,513,304],{"class":303},[286,515,322],{"class":307},[286,517,311],{"class":299},[286,519,520],{"class":288,"line":327},[286,521,331],{"emptyLinePlaceholder":330},[286,523,524],{"class":288,"line":334},[286,525,382],{"class":292},[286,527,528,530,532,534],{"class":288,"line":340},[286,529,300],{"class":299},[286,531,304],{"class":303},[286,533,505],{"class":307},[286,535,311],{"class":299},[286,537,538,540,542,544,546,548,550],{"class":288,"line":351},[286,539,317],{"class":299},[286,541,304],{"class":303},[286,543,403],{"class":299},[286,545,361],{"class":307},[286,547,169],{"class":299},[286,549,410],{"class":307},[286,551,413],{"class":299},[49,553,188,554,557,558,560,561,261,563,565,566],{},[52,555,556],{},"getSubscriptions"," the ",[52,559,96],{}," output is an array of subscription objects holding the ",[52,562,40],{},[52,564,264],{}," level",[278,567,569],{"className":280,"code":568,"language":282,"meta":16,"style":16},"[\n  { topic: 'sensors\u002Ftemperature', qos: 1 },\n  { topic: 'sensors\u002Fhumidity', qos: 2 }\n]\n",[52,570,571,576,588,600],{"__ignoreMap":16},[286,572,573],{"class":288,"line":289},[286,574,575],{"class":299},"[\n",[286,577,578,580,582,584,586],{"class":288,"line":296},[286,579,451],{"class":299},[286,581,361],{"class":307},[286,583,364],{"class":299},[286,585,368],{"class":367},[286,587,460],{"class":299},[286,589,590,592,594,596,598],{"class":288,"line":314},[286,591,451],{"class":299},[286,593,410],{"class":307},[286,595,364],{"class":299},[286,597,472],{"class":367},[286,599,475],{"class":299},[286,601,602],{"class":288,"line":327},[286,603,604],{"class":299},"]\n",[26,606,608],{"id":607},"example-cheerlights","Example: Cheerlights",[22,610,611,612,615,616,618],{},"This example subscribes to the public topic ",[52,613,614],{},"cheerlights\u002Fcoloured\u002Fhex"," on the Mosquitto test broker.",[234,617],{},"\nEach time a new color is published, the color code is displayed in the Debug panel.",[620,621],"render-flow",{":height":622,"flow":623},"200","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",[26,625,627],{"id":626},"notes","Notes",[46,629,630,633,636],{},[49,631,632],{},"The MQTT In node automatically reconnects if the connection to the broker is lost.",[49,634,635],{},"Retained messages are received immediately when subscribing to a topic that has one.",[49,637,638],{},"The node can work alongside the MQTT Out node for bi-directional communication.",[26,640,642],{"id":641},"node-documentation","Node Documentation",[644,645,646],"style",{},"html pre.shiki code .sJ8bj, html code.shiki .sJ8bj{--shiki-default:#6A737D;--shiki-dark:#6A737D}html pre.shiki code .sVt8B, html code.shiki .sVt8B{--shiki-default:#24292E;--shiki-dark:#E1E4E8}html pre.shiki code .szBVR, html code.shiki .szBVR{--shiki-default:#D73A49;--shiki-dark:#F97583}html pre.shiki code .sZZnC, html code.shiki .sZZnC{--shiki-default:#032F62;--shiki-dark:#9ECBFF}html pre.shiki code .sj4cs, html code.shiki .sj4cs{--shiki-default:#005CC5;--shiki-dark:#79B8FF}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: 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