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<title data-rh="true">Clients | DeviceScript</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://microsoft.github.io/devicescript/developer/clients"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="Clients | DeviceScript"><meta data-rh="true" name="description" content="Learn how to use clients and roles in DeviceScript to interact with Jacdac services for sensors and actuators in a home heating system example."><meta data-rh="true" property="og:description" content="Learn how to use clients and roles in DeviceScript to interact with Jacdac services for sensors and actuators in a home heating system example."><meta data-rh="true" name="keywords" content="DeviceScript,Jacdac,clients,roles,home automation"><link data-rh="true" rel="icon" href="/devicescript/img/favicon.svg"><link data-rh="true" rel="canonical" href="https://microsoft.github.io/devicescript/developer/clients"><link data-rh="true" rel="alternate" href="https://microsoft.github.io/devicescript/developer/clients" hreflang="en"><link data-rh="true" rel="alternate" href="https://microsoft.github.io/devicescript/developer/clients" hreflang="x-default"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.13.24/dist/katex.min.css" integrity="sha384-odtC+0UGzzFL/6PNoE8rX/SPcQDXBJ+uRepguP4QkPCm2LBxH3FA3y+fKSiJ+AmM" crossorigin="anonymous"><link rel="stylesheet" href="/devicescript/assets/css/styles.83f5432f.css">
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24 24" class="breadcrumbHomeIcon_sfvy"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/devicescript/developer"><span itemprop="name">Developer</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Clients</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_wXna theme-doc-toc-mobile tocMobile_Ojys"><button type="button" class="clean-btn tocCollapsibleButton_iI2p">On this page</button></div><div class="theme-doc-markdown markdown"><h1>Clients</h1><p>In DeviceScript, all access to sensors, actuators or other hardware components
are abstracted through <strong>services</strong>.
Sensors act as <strong>servers</strong> and your scripts connects <strong>clients</strong> to interact with them.
Servers are implemented by <strong>drivers</strong>, which may provide one or more services.</p><p>To interact with servers, you start clients, known as <strong>roles</strong>, for each service you need.</p><p>Let's illustrate these concept with a controller for a home heating system.
The heating system has a relay to turn on/off the furnace, a temperature sensor and
rotary encoder to change the desired temperature.
Therefore, we declare 3 roles.</p><div class="language-ts codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-ts codeBlock_RMoD thin-scrollbar"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#CF222E">import</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"> Temperature</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> Relay </span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"> </span><span class="token keyword" style="color:#CF222E">from</span><span class="token plain"> </span><span class="token string" style="color:#C6105F">"@devicescript/core"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#CF222E">const</span><span class="token plain"> thermometer </span><span class="token operator" style="color:#D73A49">=</span><span class="token plain"> </span><span class="token keyword" style="color:#CF222E">new</span><span class="token plain"> </span><span class="token class-name" style="color:#116329">Temperature</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#CF222E">const</span><span class="token plain"> thermometer2 </span><span class="token operator" style="color:#D73A49">=</span><span class="token plain"> </span><span class="token keyword" style="color:#CF222E">new</span><span class="token plain"> </span><span class="token class-name" style="color:#116329">Temperature</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#CF222E">const</span><span class="token plain"> relay </span><span class="token operator" style="color:#D73A49">=</span><span class="token plain"> </span><span class="token keyword" style="color:#CF222E">new</span><span class="token plain"> </span><span class="token class-name" style="color:#116329">Relay</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithHideOnScrollNavbar_pMLv" id="onboard-servers">Onboard servers<a href="#onboard-servers" class="hash-link" aria-label="Direct link to Onboard servers" title="Direct link to Onboard servers"></a></h2><p>You can also start servers for onboard sensors and actuators. For example, the <code>startBME680</code> function maps a BME680 sensor to 4 roles: temperature, humidity, pressure and air quality index.</p><div class="language-ts codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-ts codeBlock_RMoD thin-scrollbar"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#CF222E">import</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"> startBME680 </span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"> </span><span class="token keyword" style="color:#CF222E">from</span><span class="token plain"> </span><span class="token string" style="color:#C6105F">"@devicescript/drivers"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#6B6B6B;font-style:italic">// mount services on a BME680</span><span class="token plain"></span><br></span><span class="token-line theme-code-block-highlighted-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#CF222E">const</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"> temperature</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> humidity</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> pressure</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> airQualityIndex </span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"> </span><span class="token operator" style="color:#D73A49">=</span><span class="token plain"> </span><span class="token keyword" style="color:#CF222E">await</span><span class="token plain"> </span><span class="token function" style="color:#8250DF">startBME680</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/devicescript/developer/status-light"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Status Light</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/devicescript/developer/board-configuration"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Board Configuration</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_XG6w thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#onboard-servers" class="table-of-contents__link toc-highlight">Onboard servers</a></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div 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