{"id":9642,"date":"2025-09-09T08:03:46","date_gmt":"2025-09-09T06:03:46","guid":{"rendered":"https:\/\/medtech-ingenieur.de\/?p=9642"},"modified":"2025-09-19T16:20:32","modified_gmt":"2025-09-19T14:20:32","slug":"embedded-software-timeouts","status":"publish","type":"post","link":"https:\/\/medtech-ingenieur.de\/en\/embedded-software-timeouts\/","title":{"rendered":"Embedded Software: Everything has an end \u2013 Timeouts"},"content":{"rendered":"

In previous blog posts, I introduced two essential components of a simple and universally applicable software architecture: events with dispatchers, listeners, and data pools. These already make it easy to implement many simple use cases.<\/p>\n

But it's rarely that simple. When communicating with remote systems (e.g., a second MCU via UART), you have to react to timeouts for safety reasons. This means you have to set a timer each time and react accordingly in the timer callback function (which is called when the timer expires). Oh, and if the desired action was successful, you mustn't forget to cancel the timer as well.<\/p>\n

That means a lot of code, plus the necessary error handling and unit tests. And let's be honest: which software developer is really up for that? I'm way too lazy for it, frankly! So, what would a minimally labor-intensive solution look like?<\/p>\n

Planned delay<\/h2>\n

The solution is "Delayed Events". The necessary ingredients are:<\/p>\n

    \n
  1. A delayed event that contains the event to be scheduled at a later time as a payload, along with the timeout time.<\/li>\n
  2. A delayed event scheduler: It receives all delayed events and adds them to its internal queue in order of expiration time. A thread simply waits until the timeout of the next delayed event expires.<\/li>\n
  3. The delayed event scheduler passes the payload event to the "normal" scheduler after the timeout period has expired.<\/li>\n
  4. The delayed event scheduler gets a \u201ccancel\u201d function that removes corresponding timeout events from the queue.<\/li>\n<\/ol>\n

    \"\"<\/span><\/p>\n

    We now have all the important components needed to model even complex, time-dependent processes.<\/p>\n

    Now some of you might be asking: \u201cHow on earth do you model it?\u201d Well, that\u2019s the topic of the next blog post, which deals with the modeling and generation of state machines.<\/p>\n

    outlook<\/h2>\n

    But here's a (highly simplified) state machine for controlling a defibrillator MCU via a state machine running in the host MCU. The nice thing about this method is that the timeout handling is visualized along with the "good path."<\/p>\n

    The pattern is always the same: Along with the entry action, an event with a corresponding delay is triggered, and the entry action cancels it. It doesn't matter whether the state transition occurs due to the delayed event or another event. In this example, all timeout events lead from the root state to the state `DefiTimeoutOccured`. Of course, individual timeouts could be handled separately if needed.<\/p>\n

    \"\"<\/span><\/p>\n

    Do you need support with designing a software architecture or developing embedded software? Then please contact us. Our experienced MEDtech engineers will be happy to help you develop your medical device or clarify any outstanding questions.<\/p>","protected":false},"excerpt":{"rendered":"

    In vorangegangenen Blogbeitr\u00e4gen habe ich zwei wesentliche Komponenten einer einfachen und universell einsetzbaren Software-Architektur vorgestellt: Events mit Dispatcher, Listeners und Datapool. Damit lassen sich bereits sehr viele einfache Use-Cases einfach umsetzen. Aber einfach ist es ja nur in den seltensten F\u00e4llen. Bei der Kommunikation mit Remote-Systemen (z.B. mit einer zweiten MCU, mit der via UART […]<\/p>\n","protected":false},"author":31,"featured_media":11964,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,6],"tags":[302,291,292],"class_list":["post-9642","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-allgemein","category-software","tag-embedded-entwicklung","tag-embedded-software","tag-software-architektur","post-wrapper","thrv_wrapper"],"yoast_head":"\nEmbedded Software: Alles hat ein Ende - Timeouts - MEDtech Ingenieur GmbH<\/title>\n<meta name=\"description\" content=\"Wir zeigen dir wie man mit Timeouts und Delayed Events in Embedded-Software elegante und wartbare L\u00f6sungen f\u00fcr zeitabh\u00e4ngige Abl\u00e4ufe schafft\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/medtech-ingenieur.de\/en\/embedded-software-timeouts\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Embedded Software: Alles hat ein Ende - Timeouts - MEDtech Ingenieur GmbH\" \/>\n<meta property=\"og:description\" content=\"Wir zeigen dir wie man mit Timeouts und Delayed Events in Embedded-Software elegante und wartbare L\u00f6sungen f\u00fcr zeitabh\u00e4ngige Abl\u00e4ufe schafft\" \/>\n<meta property=\"og:url\" content=\"https:\/\/medtech-ingenieur.de\/en\/embedded-software-timeouts\/\" \/>\n<meta property=\"og:site_name\" content=\"MEDtech Ingenieur GmbH\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/medtechIngenieur\" \/>\n<meta property=\"article:published_time\" content=\"2025-09-09T06:03:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-09-19T14:20:32+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/medtech-ingenieur.de\/wp-content\/uploads\/2025\/09\/Blog-Header-Image-2.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1600\" \/>\n\t<meta property=\"og:image:height\" content=\"400\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"J\u00fcrgen Welzenbach\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@MedtechIng\" \/>\n<meta name=\"twitter:site\" content=\"@MedtechIng\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"J\u00fcrgen Welzenbach\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/embedded-software-timeouts\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/embedded-software-timeouts\\\/\"},\"author\":{\"name\":\"J\u00fcrgen Welzenbach\",\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/#\\\/schema\\\/person\\\/dd3cdc59cbb669fb0280a19479a5b1ab\"},\"headline\":\"Embedded Software: Alles hat ein Ende – Timeouts\",\"datePublished\":\"2025-09-09T06:03:46+00:00\",\"dateModified\":\"2025-09-19T14:20:32+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/embedded-software-timeouts\\\/\"},\"wordCount\":459,\"publisher\":{\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/embedded-software-timeouts\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/medtech-ingenieur.de\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/Blog-Header-Image-2.png\",\"keywords\":[\"Embedded-Entwicklung\",\"Embedded-Software\",\"Software Architektur\"],\"articleSection\":[\"Allgemein\",\"Software\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/embedded-software-timeouts\\\/\",\"url\":\"https:\\\/\\\/medtech-ingenieur.de\\\/embedded-software-timeouts\\\/\",\"name\":\"Embedded Software: Alles hat ein Ende - 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