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<b>Inputs</b> and <b>outputs</b> are used for monitoring and controlling a connected device or receiving signals from that device in order to trigger certain events.
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<p style="color:red">The information on this page is updated in accordance with the [https://wiki.teltonika-networks.com/view/FW_%26_SDK_Downloads'''00.07.4'''] firmware version .</p>
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__TOC__
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==Summary==
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In this guide, the MQTT Serial Gateway function will be configured using third-party MQTT Broker services (in this example, ''Flespi.io'').
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==Configuration overview & prerequisites==
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*Two devices with serials ports - one acts as Modbus RTU Master, another as Modbus RTU Slave;
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*Flespi.io account to act as an MQTT Broker/Publisher/Subscriber (for first configuration example);
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[[File:MQTT Serial gateway topology v2.png|border|center|class=tlt-border|847x279px]]
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If you're having trouble finding this page or some of the parameters described here on your device's WebUI, you should >turn on "Advanced WebUI" mode</b>. . You can do that by clicking the "Basic" button under "Mode", which is located at the top-right corner of the WebUI.
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RUT2 will act as a Modbus RTU slave and RUT1 as a Modbus RTU Master. On RUT1, MQTT Serial Gateway will be configured to transfer Modbus data over MQTT. Flespi.io platform will serve as an MQTT Broker
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[[File:Basic WebUI Advanced.gif|border|center|class=tlt-border|1004x1004px]]
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==RUT2 configuration==
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===Configuring Modbus RTU Slave===
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----
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Go to Services → Modbus → Modbus RTU Slave and create a new instance.
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# Enter the '''desired instance name''';
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# Select the '''desired serial interface'''.
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[[File:Modbus RTU Slave.png|border|center|class=tlt-border|855 × 308px]]
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[[File:Networking RUT955 manual input output status.png|border|center|class=tlt-border|1004x1004px]]
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==RUT1 configuration==
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===Configuring MQTT Gateway===
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----
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Go to '''Services → Modbus → MQTT Gateway''' and there:
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# '''Enable''' the '''instance''';
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# '''Enter Host''' (copied from flespi connection settings without 'wss://' and port);
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# '''Enter Username''' (Copied from flespi Connection settings generated '''token''');
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# '''Enter Password'''.
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[[File:MQTT Gateway config.png|border|center|class=tlt-border|862 × 412px]]
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'''Note''': ''Everything else can be left as default or changed according to your needs.''
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===Configuring Serial Gateway===
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----
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Under the MQTT Gateway configuration, create the Serial Gateway:
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# Enter the '''desired device ID''';
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# Select the '''desired serial interface'''.
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[[File:Serial gateway config.png|border|center|class=tlt-border|868×308px]]
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===Configuring Flespi.io MQTT Broker===
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----
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'''Log in''' or '''create an account''' on '''https://flespi.io''';
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#Navigate to '''MQTT Board''' on the '''left side''' menu;                                       
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#On the right-hand panel, top right corner, next to the name of the MQTT board, '''press the cogwheel-looking icon''' to open ''Connection Settings'';
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#In the opened window, press '''"Get flespi token"''' to generate a username;
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#Enter the '''Client name''';
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#Copy the Host address;
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#Copy '''Username''';
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#Create a '''password'''.
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Once done, save all the changes.
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[[File:Flespi board.png|border|center|class=tlt-border|1102x729px]]
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===Message format for MQTT publisher===
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----
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Modbus request data sent in the MQTT payload should be generated in accordance with the following format:
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<pre>1 <COOKIE> <SERIAL_DEVICE_ID> <TIMEOUT> <SLAVE_ID> <MODBUS_FUNCTION> <FIRST_REGISTER> <REGISTER_COUNT> </pre>
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The table below explains what each option means:
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{| class="wikitable"
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|1.  Format version
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|'''1'''
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|-
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|2. Cookie
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|from '''0''' to '''2<sup>64</sup> -1'''
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|-
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|3. Serial device ID
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|a string used to identify a serial device. Must match with <u>Device ID</u> field in MQTT Gateway page Serial gateway configuration section
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|-
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|4. Timeout
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|timeout for Modbus connection, in seconds. Range [1..999].
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|-
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|5. Slave ID
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|Indicates to which slave request is sent
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|-
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|6. Modbus function
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|Modbus task type that will be executed. Possible values are:
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        <ul>
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            <li><b>1</b> - read coils;</li>
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            <li><b>2</b> - read input coils;</li>
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            <li><b>3</b> - read holding registers;</li>
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            <li><b>4</b> - read input registers;</li>
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            <li><b>5</b> - set single coil;</li>
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            <li><b>6</b> - write to a single holding register;</li>
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            <li><b>15</b> - set multiple coils;</li>
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            <li><b>16</b> - write to multiple holding registers.</li>
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        </ul>
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|-
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|7. First register
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|number (not address) of the first register/coil/input (in range [1..65536]) from which the registers/coils/inputs will be read/written to.
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|-
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|8. Registry count
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| <li><b>1</b> - <u>coil count</u> (in range [1..2000]); must not exceed the boundary (first coil number + coil count <= 65537);</li>
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            <li><b>2</b> - <u>input count</u> (in range [1..2000]); must not exceed the boundary (first input number + input count <= 65537);</li>
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            <li><b>3</b> - <u>holding register count</u> (in range [0..125]); must not exceed the boundary (first register number + holding register count <= 65537);</li>
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            <li><b>4</b> - <u>input register count</u> (in range [0..125]); must not exceed the boundary (first register number + input register count <= 65537);</li>
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            <li><b>5</b> - <u>coil value</u> (in range [0..1]);</li>
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            <li><b>6</b> - <u>holding register value</u> (in range [0..65535]);</li>
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            <li><b>15</b> - <u>coil count</u> (in range [1..1968]); must not exceed the boundary (first coil number + coil count <= 65537); and <u>coil values</u> separated with commas, without spaces (e.g., <i>1,2,3,654,21,789</i>); there must be exactly as many values as specified (with coil count); each value must be in the range of [0..1].
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|}
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====Examples====
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----
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{| class="wikitable"
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|Setting relay (on) (Relay address is 202, which means 'Number of first register will be 203)
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|'''1 1 1 1 1 6 203 1'''
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|-
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|Getting temperature
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|'''1 1 1 1 1 3 6 2'''
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|}
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Modbus parameters are held within registers. The register numbers and corresponding system values can be found [[RUT955_Monitoring_via_Modbus#Get_Parameters|'''in this article''']].
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==Testing MQTT Publisher and Subscriber on flespi.io==
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====Adding Flespi Subscriber====
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----
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To test the Modbus Serial Gateway functionality, '''log into''' your '''Flespi account''' → '''MQTT Board''' and '''add a Subscriber''':
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#Press '''''<nowiki/>'+'''''' button on the top right corner
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#Select '''''<nowiki/>'Subscriber''''''
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# In the topic field enter '''''<nowiki/>'response''''''
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#Press '''''<nowiki/>'Subscribe'''''' button
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[[File:Flespi subscriber.png|border|class=tlt-border|496x204px]]          [[File:Flespi subscriber setup.png|border|class=tlt-border|496x205px]]
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====Adding Flespi Subscriber====
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----
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Also, you will need to '''add a Publisher''':
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#Press '''''<nowiki/>'+'''''' button on the top right corner
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#Select '''''<nowiki/>'Publisher''''''
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#In the topic field enter '''''<nowiki/>'request''''''
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#In the message field enter message, for this example '''''<nowiki/>'Getting temperature'''''' is used
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#Press '''''<nowiki/>'Publish'''''' button
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[[File:Flespi publisher.png|border|class=tlt-border|495x238px]]  [[File:Flespi publisher setup.png|border|class=tlt-border|494x239px]]
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====Flespi Subscriber output====
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----
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Check the response in the '''''<nowiki/>'Subscriber'''''' tab, you should receive a message similar to the one below.
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[[File:Flespi response.png|border|center|class=tlt-border|500x305px]]
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In the output, we can see that router's '''temperature''' is '''44 degrees Celsius'''.
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==See Also==
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*[[RUT955 Monitoring via Modbus#Get Parameters]]
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*[[RUT955_Modbus#MQTT_Gateway|MQTT Gateway and Modbus]]
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==External links==
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[https://flespi.io/#/ Flespi.io]
Retrieved from "https://wiki.teltonika-networks.com/view/Special:MobileDiff/97853...111434"