{"id":3361,"date":"2025-04-18T05:36:40","date_gmt":"2025-04-18T05:36:40","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&#038;p=3361"},"modified":"2025-06-10T10:59:29","modified_gmt":"2025-06-10T10:59:29","slug":"simplehmi-android-bluetooth-and-connection","status":"publish","type":"spl_knowledgebase","link":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/tutorial-simplehmi-programming-of-splat-controllers\/simplehmi-android-bluetooth-and-connection\/","title":{"rendered":"SimpleHMI: Android, Bluetooth and Connection"},"content":{"rendered":"\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">PLEASE IGNORE THIS PAGE<\/mark><\/strong><\/p>\n\n\n\n<p>This page belongs logically much later in the tutorial, but makes a very important point that you need to be aware of.<\/p>\n\n\n\n<p>With Android and Bluetooth, there is no certainty as to when a device is actually connected or not. Put another way, you can walk up to a machine fitted for\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/glossary-of-terms\/#o5380\">SimpleHMI<\/a>\u00a0via Bluetooth\u00a0<em>at any time<\/em>\u00a0and connect to it (if you know the pairing password).<\/p>\n\n\n\n<p>When SimpleHMI gets connected via Bluetooth, it automatically sends a Connected event to the SPLat. This is used in your program to redraw the SimpleHMI home screen.<\/p>\n\n\n\n<p><strong>If you are programming for SimpleHMI your program must be able to handle a Connected event at&nbsp;<\/strong><em>absolutely any time<\/em><strong>&nbsp;without doing anything dangerous<\/strong>.<\/p>\n\n\n\n<p>The easy way to handle the Connected event is simply to paint the home screen. You must either design your system so this is always safe,&nbsp;<em>or<\/em>&nbsp;keep track of the state of the system and select which screen to paint accordingly (probably using a Branch instruction).<\/p>\n\n\n\n<p>SimpleHMI in Android sends Connected events when it first connects and when it reconnects after being re-launched. In Android reverting to a &#8220;running&#8221; app actually re-launches it. This includes when the screen is turned on after being off.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PLEASE IGNORE THIS PAGE This page belongs logically much later in the tutorial, but makes a very important point that you need to be aware&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3355,"menu_order":3,"template":"","class_list":["post-3361","spl_knowledgebase","type-spl_knowledgebase","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SimpleHMI: Android, Bluetooth and Connection - SPLat Controls<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SimpleHMI: Android, Bluetooth and Connection - SPLat Controls\" \/>\n<meta property=\"og:description\" content=\"PLEASE IGNORE THIS PAGE This page belongs logically much later in the tutorial, but makes a very important point that you need to be aware...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/tutorial-simplehmi-programming-of-splat-controllers\/simplehmi-android-bluetooth-and-connection\/\" \/>\n<meta property=\"og:site_name\" content=\"SPLat Controls\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-10T10:59:29+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/tutorial-simplehmi-programming-of-splat-controllers\/simplehmi-android-bluetooth-and-connection\/\",\"url\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/tutorial-simplehmi-programming-of-splat-controllers\/simplehmi-android-bluetooth-and-connection\/\",\"name\":\"SimpleHMI: Android, Bluetooth and Connection - 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