v0.6.6 release

Unfortunately, this release does not yet include support for OTP-28. We recommend using a supported version such as OTP-27 for the best experience with AtomVM v0.6.6.

That said, if you're eager to experiment, our main development branch inc ludes support for OTP-28. We strive to keep up with the latest OTP changes, so adventurous users are welcome to try it out—with the usual caution that comes with using a development branch.

If you're on macOS, be aware that both Homebrew and MacPorts now default to OTP-28. To install an earlier version, you can use:

:::sh
brew install erlang@27

Alternatively, consider using asdf or mise to manage multiple Erlang/OTP versions with ease.

Please, read the getting started guide for flashing instructions.

Added

• Added the ability to run beams from the CLI for Generic Unix platform (it was already possible with nodejs and emscripten)
• Added preliminary support for ESP32P4 (no networking support yet).
• Added memory info in out_of_memory crash logs to help developers fix memory issues.
• Added documentation and function specs for uart driver
• Added uart:read/2 with a timeout parameter.
• Missing erlang:is_function/2 BIF
• Added erlang:is_record/2
• Added ability to set per-interface dhcp_hostname on Pico W if present in config.

Fixed

• Fixed specifications of nifs from esp_adc module
• ESP32: fix gpio:init/1 on GPIO >= 32
• Adding missing check, passing a non numeric argument to a function expecting a floating point might lead to a crash in certain situations.
• Fixed several bugs in http_server (#1366)
• Fixed generic_unix socket_driver to return {gen_tcp, closed} when socket is closed on Linux instead of {gen_tcp, {recv, 104}}
• Fixed a memory leak where modules were not properly destroyed when the global context is destroyd
• alisp: fix support to variables that are not binaries or integers.
• Fixed destruction of ssl-related resources
• Fixed corruption when dealing with specific situations that involve more than 16 x registers when certain VM instructions are used.
• Fixed ESP32 GPIO interrupt trigger none
• Fixed an issue where a timeout would occur immediately in a race condition
• Fixed SPI close command
• Added missing lock on socket structure
• Fixed a race condition affecting multi-core MCUs where a timeout would not be properly cleared
• Fixed a double free when esp32 uart driver was closed, yielding an assert abort
• Fixed compilation with latest debian gcc-arm-none-eabi
• Fixed network:stop/0 on ESP32 so the network can be started again
• Fixed a memory corruption caused by binary:split/2,3
• Fixed deadlock in socket code
• Fixed bug in opcode implementation (select_val): when selecting a value among many others a shallow comparison was performed, so it was working just for plain values such as atoms and small integers
• Fixed support for setting esp32 boot_path in NVS.
• Fixed race conditions in network:start/stop.
• Fixed crash calling network:sta_rssi(), when network not up.
• Fixed error handling when calling min and max with code compiled before OTP-26: there was a bug when handling errors from BIFs used as NIFs (when called with CALL_EXT and similar opcodes)
• Fixed matching of binaries on unaligned boundaries for code compiled with older versions of OTP
• Added missing out of memory handling in binary_to_atom
• Fixed call to funs such as fun erlang:'not'/1, that make use of BIFs
• Fixed potential crashes or memory leaks caused by a mistake in calculation of reference counts and a race condition in otp_socket code
• Fixed an out of memory issue by forcing GC to copy data from message fragments
• Fixed a bug where calling repeatedly process_info on a stopped process could cause an out of memory error
• Fixed possible concurrency problems in ESP32 UART driver
• Fixed concurrency and memory leak related to links and monitors
• Fixed issues with parsing of line references for stack traces
• Fixed memory corruption issue with erlang:make_tuple/2
• Fix potential use after free with code generated from OTP <= 24
• Fix is_function/2 guard
• Fixed segfault when calling lists:reverse/1 (#1600)
• Fixed nif_atomvm_posix_read GC bug
• Fixed erlang:is_number/1 function, now returns true also for floats
• Fixed unlink protocol and add support for link/1 on ports
• Do not abort when an out of memory happens while loading a literal value
• Fixed potential memory corruption when handling integer immediates that are stored as boxed integer (this never happens with integers < 28 bits)
• Correctly set Pico-W unique dhcp hostname when using the default, previously all rp2040 devices used the same "PicoW" dhcp hostname, causing collisions when multiple rp2040 are on the same network. (See issue [#1094])

Changed

• ESP32 UART driver no longer aborts because of badargs in configuration, instead raising an error
• ESP32: v0.6.6 uses esp-idf v5.4.1 for pre-built images and v5.4.x is the suggested release also for custom builds