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<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><a href="/dev/" aria-current="page" class="sidebar-link">0 - What is it for 🏠</a></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>1 - Prerequisites🧭</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>2 - Set it up 🔨</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>3 - Upload ➡️</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>4 - Use ✈️</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/dev/use/rf.html" class="sidebar-link">RF gateways (RTL_433/RCSwitch/RF/RF2)</a></li><li><a href="/dev/use/ble.html" class="sidebar-link">BLE ESP32 gateway</a></li><li><a href="/dev/use/ir.html" class="sidebar-link">Infrared gateway</a></li><li><a href="/dev/use/lora.html" class="sidebar-link">LoRa gateway</a></li><li><a href="/dev/use/gsm.html" class="sidebar-link">GSM 2G gateway</a></li><li><a href="/dev/use/rs232.html" aria-current="page" class="active sidebar-link">RS232 gateway</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/dev/use/rs232.html#sending-an-rs232-message" class="sidebar-link">Sending an RS232 message</a></li><li class="sidebar-sub-header"><a href="/dev/use/rs232.html#receiving-an-rs232-message" class="sidebar-link">Receiving an RS232 message</a></li></ul></li><li><a href="/dev/use/rfm69.html" class="sidebar-link">RFM69 gateway</a></li><li><a href="/dev/use/sensors.html" class="sidebar-link">Sensors</a></li><li><a href="/dev/use/actuators.html" class="sidebar-link">Actuators</a></li><li><a href="/dev/use/boards.html" class="sidebar-link">Boards</a></li><li><a href="/dev/use/displays.html" class="sidebar-link">Displays</a></li><li><a href="/dev/use/gateway.html" class="sidebar-link">System commands (ESP only)</a></li><li><a href="/dev/use/webui.html" class="sidebar-link">WebUI</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>5 - Integrate 🎉</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>6 - Participate 💻</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="rs232-gateway"><a href="#rs232-gateway" class="header-anchor">#</a> RS232 gateway</h1> <p>The RS232 gateway can be used to send and receive data from the serial connection to and from MQTT. Both softwareSerial as hardwareSerial are supported. HardwareSerial can be used for higher baud rates, but is limited to specific pins on most platforms.</p> <h2 id="sending-an-rs232-message"><a href="#sending-an-rs232-message" class="header-anchor">#</a> Sending an RS232 message</h2> <p>Simply publish the message you wish to transmit, minus the prefix and postfix. For example, to send the "Turn On" signal for a Mitsubishi XD221U projector, the code is simply '!' so you would use the command</p> <p><code>mosquitto_pub -t home/OpenMQTTGateway/commands/MQTTtoRS232 -m '{"value": "!"}'</code></p> <p>It will automatically add the prefix and postfix you set in <a href="https://github.com/1technophile/OpenMQTTGateway/blob/master/main/config_RS232.h" target="_blank" rel="noopener noreferrer">config_RS232.h<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a>.</p> <h2 id="receiving-an-rs232-message"><a href="#receiving-an-rs232-message" class="header-anchor">#</a> Receiving an RS232 message</h2> <p>Two modes are available for receiving RS232 messages.</p> <h3 id="single-mqtt-message-mode-default"><a href="#single-mqtt-message-mode-default" class="header-anchor">#</a> Single MQTT message mode (default)</h3> <p>To receive a message, subscribe to all with <code>mosquitto_sub -t +/# -v</code>
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and perform an action that should get a response from the device. For example, If I were to send the "Turn On" signal from earlier, I would receive back</p> <div class="language-json line-numbers-mode"><pre class="language-json"><code>home/OpenMQTTGateway/RS232toMQTT <span class="token punctuation">{</span><span class="token property">"value"</span><span class="token operator">:</span><span class="token string">"1"</span><span class="token punctuation">}</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Because this projector echoes back a received command to acknowledge. Some devices will send a NACK, or Negative Acknowledge, to confirm that they received your message but could not comply. That would look like</p> <div class="language-json line-numbers-mode"><pre class="language-json"><code>home/OpenMQTTGateway/RStoMQTT <span class="token punctuation">{</span><span class="token property">"value"</span><span class="token operator">:</span><span class="token string">"!:N"</span><span class="token punctuation">}</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="json-mode"><a href="#json-mode" class="header-anchor">#</a> JSON mode</h3> <p>This mode can be used if the received message on the serial link is JSON. The JSON keys are used as separate MQTT sub-topics. For nested JSON this will be repeated for sub-keys up to the specified nesting level.</p> <p>For example:</p> <p>input received at serial link:</p> <div class="language-json line-numbers-mode"><pre class="language-json"><code><span class="token punctuation">{</span>temperature<span class="token operator">:</span> <span class="token punctuation">{</span>sens1<span class="token operator">:</span> <span class="token number">22</span><span class="token punctuation">,</span> sens2<span class="token operator">:</span> <span class="token number">23</span><span class="token punctuation">}</span><span class="token punctuation">,</span> humidity<span class="token operator">:</span> <span class="token punctuation">{</span>sens1<span class="token operator">:</span> <span class="token number">80</span><span class="token punctuation">,</span> sens2<span class="token operator">:</span> <span class="token number">60</span><span class="token punctuation">}</span><span class="token punctuation">}</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>output in case of max nesting level 1:</p> <div class="language-json line-numbers-mode"><pre class="language-json"><code>home/OpenMQTTGateway/RS232toMQTT/temperature <span class="token string">"{sens1: 22, sens2: 23}"</span>
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home/OpenMQTTGateway/RS232toMQTT/humidity <span class="token string">"{sens1: 80, sens2: 60}"</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>output in case of max nesting level 2 (or higher):</p> <div class="language-json line-numbers-mode"><pre class="language-json"><code>home/OpenMQTTGateway/RS232toMQTT/temperature/sens1 <span class="token number">22</span>
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home/OpenMQTTGateway/RS232toMQTT/temperature/sens2 <span class="token number">23</span>
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home/OpenMQTTGateway/RS232toMQTT/humidity/sens1 <span class="token number">80</span>
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home/OpenMQTTGateway/RS232toMQTT/humidity/sens2 <span class="token number">60</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/1technophile/OpenMQTTGateway/edit/development/docs/use/rs232.md" target="_blank" rel="noopener noreferrer">Edit this page</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">12/12/2023, 8:03:11 PM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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