• We now have native compilation for ESP32! That opens a lot of possibilities!
• Mirage is available for ESP32 target, it allows to build complex applications for this platform, such as an HTTPS server.
• All this work is stored under a Github organization: well-typed-lightbulbs.

# Native backend

• OCaml 4.06.0 with xtensa target and custom settings to build the bytecode runtime on the ESP32. The best way to have a functional cross-esp32 toolchain is to install the ocaml-esp32 opam package from opam-cross-esp32. It requires an 4.06.0+32bit base compiler.
  • Github - ocaml-esp32
• I have code generation and linking working. This is an example with the files I used to build my native hello world!
  • Github - ocaml docker sample

# Cross-compilation of a Mirage unikernel

• See Build your own Mirage article to find out more about building a Mirage unikernel.

# Mirage unikernel samples

• Three sample docker scripts that build for ESP32: esp32-docker-samples. They build C, OCaml and Mirage code.
• Three sample Mirage applications: mirage-esp32-samples. hello_world: a basic printer. ap_dhcp: an access point delivering IPs trough DHCP. lcd_wifi_demo: makes use of network and lcd screen features.