MQTTVersion3.
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pdfTechnicalCommittee:OASISMessageQueuingTelemetryTransport(MQTT)TCChairs:RaphaelJCohn(raphael.
cohn@stormmq.
com),IndividualRichardJCoppen(coppen@uk.
ibm.
com),IBMEditors:AndrewBanks(Andrew_Banks@uk.
ibm.
com),IBMRahulGupta(rahul.
gupta@us.
ibm.
com),IBMAdditionalartifacts:ThisprosespecificationisonecomponentofaWorkProductthatalsoincludes:MQTTVersion3.
1.
1Errata01.
EditedbyAndrewBanksandRahulGupta.
10December2015.
OASISApprovedErrata.
http://docs.
oasis-open.
org/mqtt/mqtt/v3.
1.
1/errata01/os/mqtt-v3.
1.
1-errata01-os.
html.
Relatedwork:Thisspecificationreplacesorsupersedes:MQTTVersion3.
1.
1.
EditedbyAndrewBanksandRahulGupta.
29October2014.
OASISStandard.
http://docs.
oasis-open.
org/mqtt/mqtt/v3.
1.
1/os/mqtt-v3.
1.
1-os.
html.
Thisspecificationisrelatedto:MQTTandtheNISTCybersecurityFrameworkVersion1.
0.
EditedbyGeoffBrownandLouis-PhilippeLamoureux.
Latestversion:http://docs.
oasis-open.
org/mqtt/mqtt-nist-cybersecurity/v1.
0/mqtt-nist-cybersecurity-v1.
0.
html.
Abstract:MQTTisaClientServerpublish/subscribemessagingtransportprotocol.
Itislightweight,open,simple,anddesignedsoastobeeasytoimplement.
Thesecharacteristicsmakeitidealforuseinmanysituations,includingconstrainedenvironmentssuchasforcommunicationinMachinetoMachine(M2M)andInternetofThings(IoT)contextswhereasmallcodefootprintisrequiredand/ornetworkbandwidthisatapremium.
TheprotocolrunsoverTCP/IP,oroverothernetworkprotocolsthatprovideordered,lossless,bi-directionalconnections.
Itsfeaturesinclude:Useofthepublish/subscribemessagepatternwhichprovidesone-to-manymessagedistributionanddecouplingofapplications.
Amessagingtransportthatisagnostictothecontentofthepayload.
Threequalitiesofserviceformessagedelivery:"Atmostonce",wheremessagesaredeliveredaccordingtothebesteffortsoftheoperatingenvironment.
Messagelosscanoccur.
Thislevelcouldbeused,forexample,withambientsensordatawhereitdoesnotmatterifanindividualreadingislostasthenextonewillbepublishedsoonafter.
"Atleastonce",wheremessagesareassuredtoarrivebutduplicatescanoccur.
"Exactlyonce",wheremessageareassuredtoarriveexactlyonce.
Thislevelcouldbeused,forexample,withbillingsystemswhereduplicateorlostmessagescouldleadtoincorrectchargesbeingapplied.
Asmalltransportoverheadandprotocolexchangesminimizedtoreducenetworktraffic.
Amechanismtonotifyinterestedpartieswhenanabnormaldisconnectionoccurs.
Status:ThisdocumentwaslastrevisedorapprovedbytheOASISMessageQueuingTelemetryTransport(MQTT)TContheabovedate.
Thelevelofapprovalisalsolistedabove.
Checkthe"Latestversion"locationnotedaboveforpossiblelaterrevisionsofthisdocument.
AnyothernumberedVersionsandothertechnicalworkproducedbytheTechnicalCommittee(TC)arelistedathttps://www.
oasis-open.
org/committees/tc_home.
phpwg_abbrev=mqtt#technical.
TCmembersshouldsendcommentsonthisspecificationtotheTC'semaillist.
OthersshouldsendcommentstotheTC'spubliccommentlist,aftersubscribingtoitbyfollowingtheinstructionsatthe"SendAComment"buttonontheTC'swebpageathttps://www.
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Forinformationonwhetheranypatentshavebeendisclosedthatmaybeessentialtoimplementingthisspecification,andanyoffersofpatentlicensingterms,pleaserefertotheIntellectualPropertyRightssectionoftheTechnicalCommitteewebpage(https://www.
oasis-open.
org/committees/mqtt/ipr.
php).
Citationformat:Whenreferencingthisspecificationthefollowingcitationformatshouldbeused:[mqtt-v3.
1.
1-plus-errata01]MQTTVersion3.
1.
1PlusErrata01.
EditedbyAndrewBanksandRahulGupta.
10December2015.
OASISStandardIncorporatingApprovedErrata01.
http://docs.
oasis-open.
org/mqtt/mqtt/v3.
1.
1/errata01/os/mqtt-v3.
1.
1-errata01-os-complete.
html.
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