{"id":7230,"date":"2026-11-10T11:36:30","date_gmt":"2026-11-10T10:36:30","guid":{"rendered":"https:\/\/www.pschatzmann.ch\/home\/?p=7230"},"modified":"2026-11-07T13:01:25","modified_gmt":"2026-11-07T12:01:25","slug":"your-microcontrollers-files-one-open-away-over-bluetooth-le","status":"publish","type":"post","link":"https:\/\/www.pschatzmann.ch\/home\/2026\/11\/10\/your-microcontrollers-files-one-open-away-over-bluetooth-le\/","title":{"rendered":"Your microcontroller&#8217;s files, one `open()` away \u2013 over Bluetooth LE"},"content":{"rendered":"<p>What if the SD card or LittleFS partition of your ESP32 looked like a folder on your other devices, without Wi-Fi, a web server or a USB cable?<\/p>\n<p><strong>TinyBLEFS<\/strong> joins a family of small, header-only libraries for moving data on and off Arduino boards: <a href=\"https:\/\/github.com\/pschatzmann\/TinyNBD\">TinyNBD<\/a> exports their storage as a linux network block device, <a href=\"https:\/\/github.com\/pschatzmann\/TinyFTP\">TinyFTP<\/a> reads and writes remote files over FTP (client and server) and <a href=\"https:\/\/github.com\/pschatzmann\/TinySMB\">TinySMB<\/a> shares them with Windows, macOS and Linux as an SMB file share. Now files get a <strong>Bluetooth route<\/strong> too.<\/p>\n<p><strong>TinyBLEFS<\/strong> makes that possible: a header-only C++ library. A board shares its file system over BLE, and any other board (or your Linux PC) mounts it and uses the familiar Arduino <code>File<\/code> API.<\/p>\n<h2 id=\"what-you-get\">What you get<\/h2>\n<ul>\n<li><strong>Several servers, one namespace.<\/strong> Each server announces its name and shows up under <code>\/&lt;name&gt;<\/code>.<\/li>\n<li><strong>Read and write.<\/strong> Open, list, create, delete, rename, copy between servers.<\/li>\n<li><strong>Bring your own BLE library.<\/strong> Adapters for NimBLE, ArduinoBLE, Pico W and SimpleBLE; a tiny transport interface for the rest.<\/li>\n<li><strong>Bring your own file system.<\/strong> LittleFS, SPIFFS, FFat, SD, SD_MMC, TinyFATFS, or <code>std::filesystem<\/code> on Linux.<\/li>\n<li><strong>More than one client<\/strong> at a time, with file locking so readers and writers don&#8217;t collide.<\/li>\n<li><strong>Linux tools:<\/strong> <code>tinyblefs<\/code> to browse and copy files from the shell, <code>tinyblefs-server<\/code> to share a PC directory.<\/li>\n<\/ul>\n<h2 id=\"how-fast\">How fast?<\/h2>\n<p>Between two ESP32 boards we measured 50\u201355 KB\/s. Through a PC with an old Bluetooth 4.0 adapter it is about 9 KB\/s, which is a limit of that controller, not of the library.<\/p>\n<h2 id=\"status\">Status<\/h2>\n<p>This is a <strong>proof of concept<\/strong>: the protocol and the API may still change, and it has only had first tests on real hardware (ESP32, ESP32-S3, Pico W, UNO R4 WiFi). Feedback and bug reports are very welcome.<\/p>\n<p><strong>Further Info:<\/strong> <a href=\"https:\/\/github.com\/pschatzmann\/TinyBLEFS\">https:\/\/github.com\/pschatzmann\/TinyBLEFS<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>What if the SD card or LittleFS partition of your ESP32 looked like a folder on your other devices, without Wi-Fi, a web server or a USB cable? TinyBLEFS joins a family of small, header-only libraries for moving data on and off Arduino boards: TinyNBD exports their storage as a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7231,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","_exactmetrics_skip_tracking":false,"footnotes":""},"categories":[20],"tags":[],"class_list":["post-7230","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Your microcontroller&#039;s files, one `open()` away \u2013 over Bluetooth LE - Phil Schatzmann<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pschatzmann.ch\/home\/2026\/11\/10\/your-microcontrollers-files-one-open-away-over-bluetooth-le\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Your microcontroller&#039;s files, one `open()` away \u2013 over Bluetooth LE - Phil Schatzmann\" \/>\n<meta property=\"og:description\" content=\"What if the SD card or LittleFS partition of your ESP32 looked like a folder on your other devices, without Wi-Fi, a web server or a USB cable? TinyBLEFS joins a family of small, header-only libraries for moving data on and off Arduino boards: TinyNBD exports their storage as a [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.pschatzmann.ch\/home\/2026\/11\/10\/your-microcontrollers-files-one-open-away-over-bluetooth-le\/\" \/>\n<meta property=\"og:site_name\" content=\"Phil Schatzmann\" \/>\n<meta property=\"article:published_time\" content=\"2026-11-10T10:36:30+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.pschatzmann.ch\/wp-content\/uploads\/2026\/11\/TinyBLEFS.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"559\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"pschatzmann\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"pschatzmann\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2026\\\/11\\\/10\\\/your-microcontrollers-files-one-open-away-over-bluetooth-le\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2026\\\/11\\\/10\\\/your-microcontrollers-files-one-open-away-over-bluetooth-le\\\/\"},\"author\":{\"name\":\"pschatzmann\",\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/#\\\/schema\\\/person\\\/73a53638a4e34e8373405fd737dac9b1\"},\"headline\":\"Your microcontroller&#8217;s files, one `open()` away \u2013 over Bluetooth LE\",\"datePublished\":\"2026-11-10T10:36:30+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2026\\\/11\\\/10\\\/your-microcontrollers-files-one-open-away-over-bluetooth-le\\\/\"},\"wordCount\":303,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/#\\\/schema\\\/person\\\/73a53638a4e34e8373405fd737dac9b1\"},\"image\":{\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2026\\\/11\\\/10\\\/your-microcontrollers-files-one-open-away-over-bluetooth-le\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.pschatzmann.ch\\\/wp-content\\\/uploads\\\/2026\\\/11\\\/TinyBLEFS.jpeg\",\"articleSection\":[\"Arduino\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2026\\\/11\\\/10\\\/your-microcontrollers-files-one-open-away-over-bluetooth-le\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2026\\\/11\\\/10\\\/your-microcontrollers-files-one-open-away-over-bluetooth-le\\\/\",\"url\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2026\\\/11\\\/10\\\/your-microcontrollers-files-one-open-away-over-bluetooth-le\\\/\",\"name\":\"Your microcontroller's files, one `open()` away \u2013 over Bluetooth LE - 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