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SIM800 Series_MQTT_Application Note_V1.03.pdf

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    About Document
    Version History
    Scope
    Contents
    1Introduction
    1.1Purpose of the document
    1.2Related documents
    1.3Conventions and abbreviations
    2MQTT Introduction
    3AT Commands for MQTT
    3.1AT+SMCONF Set MQTT Parameter
    3.2AT+SAZURECONF Set Azure IoT Parameter
    3.3 AT+SMCONN MQTT Connection
    3.4 AT+SMSUB Subscribe Packet
    3.5 AT+SMPUB Publish Packet
    3.6AT+SMUNSUB Unsubscribe Packet
    3.7AT+SMSTATE Inquire MQTT Connection Status
    3.8AT+SMDISC Disconnect MQTT
    3.9AT+SMSSL Set MQTT to Use SSL Function
    3.10+SMPUBLISH Received Data
    4MQTT Examples
    4.1Standard MQTT
    4.2MQTT Connecting to Azure IoT
    SIM800 Series_MQTT _Application Note GPRS Module SIMCom Wireless Solutions Limited Building B, SIM Technology Building, No.633, Jinzhong Road Changning District, Shanghai P.R. China Tel: 86-21-31575100 support@simcom.com www.simcom.com
    SIM800 Series_MQTT_Application Note_V1.03 Document Title: Version: Date: Status: GENERAL NOTES SIM800 Series _MQTT_Application Note 1.03 2020.10.16 Released SIMCOM OFFERS THIS INFORMATION AS A SERVICE TO ITS CUSTOMERS, TO SUPPORT APPLICATION AND ENGINEERING EFFORTS THAT USE THE PRODUCTS DESIGNED BY SIMCOM. THE INFORMATION PROVIDED IS BASED UPON REQUIREMENTS SPECIFICALLY PROVIDED TO SIMCOM BY THE CUSTOMERS. SIMCOM HAS NOT UNDERTAKEN ANY INDEPENDENT SEARCH FOR ADDITIONAL RELEVANT INFORMATION, INCLUDING ANY INFORMATION THAT MAY BE IN THE CUSTOMER’S POSSESSION. FURTHERMORE, SYSTEM VALIDATION OF THIS PRODUCT DESIGNED BY SIMCOM WITHIN A LARGER ELECTRONIC SYSTEM REMAINS THE RESPONSIBILITY OF THE CUSTOMER OR THE CUSTOMER’S SYSTEM INTEGRATOR. ALL SPECIFICATIONS SUPPLIED HEREIN ARE SUBJECT TO CHANGE. COPYRIGHT THIS DOCUMENT CONTAINS PROPRIETARY TECHNICAL INFORMATION WHICH IS THE PROPERTY OF SIMCOM WIRELESS SOLUTIONS LIMITED COPYING, TO OTHERS AND USING THIS DOCUMENT, ARE FORBIDDEN WITHOUT EXPRESS AUTHORITY BY SIMCOM. OFFENDERS ARE LIABLE TO THE PAYMENT OF INDEMNIFICATIONS. ALL RIGHTS RESERVED BY SIMCOM IN THE PROPRIETARY TECHNICAL INFORMATION ，INCLUDING BUT NOT LIMITED TO REGISTRATION GRANTING OF A PATENT , A UTILITY MODEL OR DESIGN. ALL SPECIFICATION SUPPLIED HEREIN ARE SUBJECT TO CHANGE WITHOUT NOTICE AT ANY TIME. SIMCom Wireless Solutions Limited Building B, SIM Technology Building, No.633 Jinzhong Road, Changning District, Shanghai P.R. China Tel: +86 21 31575100 Email: simcom@simcom.com For more information, please visit: https://www.simcom.com/download/list-863-en.html For technical support, or to report documentation errors, please visit: https://www.simcom.com/ask/ or email to: support@simcom.com Copyright © 2020 SIMCom Wireless Solutions Limited All Rights Reserved. www.simcom.com 2 / 16
    SIM800 Series_MQTT_Application Note_V1.03 About Document Version History Version Date 1.00 1.01 2017-10-11 2019-12-10 Owner Dingfen.Zhu Xiaohui.Xu 1.02 1.03 2020-06-15 Yizhe.Tan /Wenjie.Lai 2020-10-16 Wenjie.Lai What is new Original Chapter 2.2, Add AT+SAZURECONF Chapter 3.2, Add MQTT Connecting to Azure IoT Modify format and style Chapter 4.1,Modidy examples and format Scope This document presents the AT command of MQTT operation and application examples. This document can apply to SIM800 series modules with MQTT function. www.simcom.com 3 / 16
    SIM800 Series_MQTT_Application Note_V1.03 Contents About Document.................................................................................................................................. 3 Version History.........................................................................................................................................................3 Scope........................................................................................................................................................................ 3 Contents................................................................................................................................................. 4 Introduction.................................................................................................................................... 5 1 Purpose of the document...........................................................................................................................5 1.1 Related documents.....................................................................................................................................5 1.2 Conventions and abbreviations................................................................................................................ 5 1.3 2 MQTT Introduction........................................................................................................................6 3 AT Commands for MQTT.............................................................................................................7 AT+SMCONF Set MQTT Parameter.................................................................................................... 7 3.1 AT+SAZURECONF Set Azure IoT Parameter.................................................................................... 8 3.2 AT+SMCONN MQTT Connection..........................................................................................................8 3.3 AT+SMSUB Subscribe Packet...............................................................................................................9 3.4 AT+SMPUB Publish Packet................................................................................................................... 9 3.5 AT+SMUNSUB Unsubscribe Packet.................................................................................................. 10 3.6 AT+SMSTATE Inquire MQTT Connection Status............................................................................. 11 3.7 AT+SMDISC Disconnect MQTT.......................................................................................................... 11 3.8 AT+SMSSL Set MQTT to Use SSL Function.................................................................................... 11 3.9 3.10 +SMPUBLISH Received Data............................................................................................................. 12 4 MQTT Examples.......................................................................................................................... 13 Standard MQTT.........................................................................................................................................13 4.1 4.2 MQTT Connecting to Azure IoT..............................................................................................................14 www.simcom.com 4 / 16
    SIM800 Series_MQTT_Application Note_V1.03 1 Introduction 1.1Purpose of the document Based on module AT command manual, this document will introduce MQTT application process. Developers could understand and develop application quickly and efficiently based on this document. 1.2Related documents [1] SIM800 Series_AT Command Manual 1.3Conventions and abbreviations Abbreviations GPRS PDP MQTT Description General Packet Radio Service Packet Data Protocol Message Queuing Telemetry Transport www.simcom.com 5 / 16
    SIM800 Series_MQTT_Application Note_V1.03 2 MQTT Introduction MQTT (Message Queue Telemetry Transport) is a messaging protocol based on the publish/subscribe paradigm under the ISO standard (ISO/IEC PRF 20922). The MQTT protocol is a protocol designed for the communication of remote sensors and control devices with limited computing power and working on low-bandwidth, unreliable networks. It has the following main features: 1) Use the publish/subscribe message mode to provide one-to-many message publishing and uncouple application. 2) Message transmission blocked by the payload content. 3) Provide network connectivity using TCP/IP. 4) There are three types of message publishing service quality:  “At most once”, the message is completely dependent on the underlying TCP/IP network. Message loss or duplication can occur. This level can be used in the following situations, environmental sensor data, loss of a read record does not matter, because there will be a second transmission in the near future.  “At least once” to ensure that the message arrives, but message duplication may occur.  “Only once” to ensure that the message arrives once. This level can be used in situations where repeated or missing messages can result in incorrect results. 5) Small transmission, low overhead (fixed length header is 2 bytes), protocol exchange is minimized to reduce network traffic. 6) Use Last Will and Testament features to notify the mechanism of abnormal client interruption. www.simcom.com 6 / 16
    SIM800 Series_MQTT_Application Note_V1.03 3 AT Commands for MQTT SIM800 series modules provide MQTT AT command is as follows: AT Command AT+SMCONF AT+SAZURECONF AT+SMCONN AT+SMSUB AT+SMUNSUB AT+SMPUB AT+SMSTATE AT+SMDISC AT+SMSSL +SMPUBLISH Description Set MQTT Parameter Set Azure IoT Parameter MQTT Connection Subscribe Packet Unsubscribe Packet Publish Packet Inquire MQTT Connection Status Disconnect MQTT Set MQTT to Use SSL Function Received Data 3.1AT+SMCONF Set MQTT Parameter AT+SMCONF Set MQTT Parameter Response Test Command AT+SMCONF=? +SMCONF: "MQTTParamTag","MQTTParamValue" Read Command AT+SMCONF? OK Response +SMCONF: , Write Command AT+SMCONF=, OK. Response OK or +CME ERROR: Parameters MQTT Parameter Bearer profile identifier "CID" "URL" MQTT Server URL www.simcom.com 7 / 16
    SIM800 Series_MQTT_Application Note_V1.03 "serve:tcpPort" "server": FQDN or IP-address "tcpPort": default value is 1883 "CLIENTID" Client connection id. Default is NULL. "KEEPALIVE" Hold connect time.default:60,Range: (60-3600) "CLEANSS" Clean session flag，default:0，Range:(0-1) "USERNAME" User name. default null "PASSWORD" Password，default null "TIMEOUT" MQTT response timeout value Reference MQTT Parameter value Note 3.2AT+SAZURECONF Set Azure IoT Parameter AT+SAZURECONF Set Azure IoT Parameter Test Command AT+SAZURECONF=? Response +SAZURECONF: "url","deviceId","deviceKey", Write Command AT+SAZURECONF=, ,, OK Response OK or +CME ERROR: Parameters < URL> Azure IoT HostName "serve:tcpPort" "server": HostName "tcpPort": Port need to configure to 8883. The Id of the Azure IoT Device. The "PrimaryKey" of the Azure IoT Device. Expiration time,Rang:0~3600*24*365(second). Note Reference 3.3 AT+SMCONN MQTT Connection AT+SMCONN MQTT Connection www.simcom.com 8 / 16
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