Exec Lua is a free Android development environment for the Lua scripting language. This app provides a platform for developing, running, and managing Lua scripts. The Lua Script Engineexecutes the Lua scripts. The app has several features, including code execution, syntax highlighting, and line numbering. Additionally, it has an input form, save/open file, and HTTP client (GET, POST, PUT, HEAD, OAUTH2, etc.).

Exec Lua also has an MQTT client for publishing and subscribing. It includes OpenAI Prompt Engineering and an OpenAI chatbot example. Users can develop and test OpenAI GPT-3 prompts with Lua scripts. The app has several Android-specific functions, including opening an input form with or without a default value, showing a pop-up notification message, and HTTP request. It also supports OAuth2 and MQTT, including connect, onMqttMessage, subscribe, publish, and disconnect functions. Several sample files are included.