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<title data-rh="true">Settings and Secrets | 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/settings"><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="Settings and Secrets | DeviceScript"><meta data-rh="true" name="description" content="Settings provides a friendly layer to read/write objects from the device flash. Keep it small, there's not a lot of space!"><meta data-rh="true" property="og:description" content="Settings provides a friendly layer to read/write objects from the device flash. Keep it small, there's not a lot of space!"><link data-rh="true" rel="icon" href="/devicescript/img/favicon.svg"><link data-rh="true" rel="canonical" href="https://microsoft.github.io/devicescript/developer/settings"><link data-rh="true" rel="alternate" href="https://microsoft.github.io/devicescript/developer/settings" hreflang="en"><link data-rh="true" rel="alternate" href="https://microsoft.github.io/devicescript/developer/settings" 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">Settings and Secrets</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>Settings</h1><p>Settings <a href="/devicescript/developer/packages">builtin package</a> provides a friendly layer to read/write objects from the device flash. <strong>Keep it small, there's not a lot of space!</strong></p><div class="theme-admonition theme-admonition-tip alert alert--success admonition_uH4V"><div class="admonitionHeading_P5_N"><span class="admonitionIcon_MF44"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_yySL"><p>In Visual Studio Code, open the command palette and run <strong>DeviceScript: Add Device Settings...</strong>.</p></div></div><h2 class="anchor anchorWithHideOnScrollNavbar_pMLv" id="env-files">.env files<a href="#env-files" class="hash-link" aria-label="Direct link to .env files" title="Direct link to .env files"></a></h2><p>Don't store secrets or settings in the code, use <code>.env</code> files instead.</p><ul><li><code>./.env.defaults</code>: store general settings (<strong>tracked by version control</strong>)</li><li><code>./.env.local</code>: store secrets or override for general settings (<strong>untracked by version control</strong>)</li></ul><p>The <code>.env*</code> file use a similar format to node.js <code>.env</code> file. The content will be transfered in the device flash
when deploying the DeviceScript bytecode.</p><div class="theme-admonition theme-admonition-caution alert alert--warning admonition_uH4V"><div class="admonitionHeading_P5_N"><span class="admonitionIcon_MF44"><svg viewBox="0 0 16 16"><path fill-rule="evenodd" d="M8.893 1.5c-.183-.31-.52-.5-.887-.5s-.703.19-.886.5L.138 13.499a.98.98 0 0 0 0 1.001c.193.31.53.501.886.501h13.964c.367 0 .704-.19.877-.5a1.03 1.03 0 0 0 .01-1.002L8.893 1.5zm.133 11.497H6.987v-2.003h2.039v2.003zm0-3.004H6.987V5.987h2.039v4.006z"></path></svg></span>caution</div><div class="admonitionContent_yySL"><p>The setting keys should be shorter than 14 characters!</p></div></div><div class="language-env codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockTitle_x_ju">./.env.defaults</div><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-env codeBlock_RMoD thin-scrollbar"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#393A34"><span class="token plain"># Default settings</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"># This file is tracked by git.</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"># DO NOT store secrets in this file.</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">temperature=68</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 class="language-env codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockTitle_x_ju">./.env.local</div><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-env codeBlock_RMoD thin-scrollbar"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#393A34"><span class="token plain"># Local settings and secrets</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"># This file is/should **NOT** tracked by git</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">temperature=70 # override</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">PASSWORD=secret</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 class="theme-admonition theme-admonition-tip alert alert--success admonition_uH4V"><div class="admonitionHeading_P5_N"><span class="admonitionIcon_MF44"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_yySL"><p>In Visual Studio Code, open the command palette and run <strong>DeviceScript: Add Device Settings...</strong>.
From the CLI, run <code>devs add settings</code>.</p></div></div><h2 class="anchor anchorWithHideOnScrollNavbar_pMLv" id="special-settings">Special Settings<a href="#special-settings" class="hash-link" aria-label="Direct link to Special Settings" title="Direct link to Special Settings"></a></h2><p>Some settings entries are treaty specially and routed to other services:</p><ul><li><code>WIFI_SSID</code>: set the WiFi SSID to connect to</li><li><code>WIFI_PWD</code>: set the WiFi password (skip or leave empty to connect to open WiFi)</li></ul><h2 class="anchor anchorWithHideOnScrollNavbar_pMLv" id="using-settings">Using settings<a href="#using-settings" class="hash-link" aria-label="Direct link to Using settings" title="Direct link to Using settings"></a></h2><p>Once your .env files are ready, you can use <code>readSetting</code> and <code>writeSetting</code> to read/write settings.</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"> Button </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"></span><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"> readSetting</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> writeSetting </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/settings"</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"> temperature </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"> button </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">Button</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 theme-code-block-highlighted-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#CF222E">let</span><span class="token plain"> threshold </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 generic-function function" style="color:#8250DF">readSetting</span><span class="token generic-function generic class-name operator" style="color:#D73A49"><</span><span class="token generic-function generic class-name builtin" style="color:#116329">number</span><span class="token generic-function generic class-name operator" style="color:#D73A49">></span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#C6105F">"temperature"</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" 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">// show alert when temperature is above threshold</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">temperature</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">reading</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">subscribe</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">t </span><span class="token operator" style="color:#D73A49">=></span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</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">if</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">t </span><span class="token operator" style="color:#D73A49">></span><span class="token plain"> threshold</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </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 comment" style="color:#6B6B6B;font-style:italic">// too hot!</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token builtin">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#C6105F">"hot!"</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 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 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" 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">// increase threshold when button is pressed</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">button</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">down</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">subscribe</span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#CF222E">async</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</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 punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> threshold</span><span class="token operator" style="color:#D73A49">++</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">await</span><span class="token plain"> </span><span class="token function" style="color:#8250DF">writeSetting</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#C6105F">"temperature"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> threshold</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 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="clearing">Clearing<a href="#clearing" class="hash-link" aria-label="Direct link to Clearing" title="Direct link to Clearing"></a></h2><p>You can use the command <strong>DeviceScript: Clear Device Setings...</strong> to clear the settings
of the currently connected device.</p><h2 class="anchor anchorWithHideOnScrollNavbar_pMLv" id="see-also">See also<a href="#see-also" class="hash-link" aria-label="Direct link to See also" title="Direct link to See also"></a></h2><ul><li><a href="/devicescript/api/settings">API reference</a></li></ul></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/observables"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Observables</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/devicescript/developer/testing"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Testing</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="#env-files" class="table-of-contents__link toc-highlight">.env files</a></li><li><a href="#special-settings" class="table-of-contents__link toc-highlight">Special Settings</a></li><li><a href="#using-settings" class="table-of-contents__link toc-highlight">Using settings</a></li><li><a href="#clearing" class="table-of-contents__link toc-highlight">Clearing</a></li><li><a href="#see-also" class="table-of-contents__link toc-highlight">See also</a></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Docs</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/devicescript/intro">Introduction</a></li><li class="footer__item"><a class="footer__link-item" href="/devicescript/developer">Developer</a></li><li class="footer__item"><a class="footer__link-item" href="/devicescript/language">Language 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