LUA Reference Guide
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EdgeTX v2.7
EdgeTX 2.7 Lua Reference Guide
Introduction
Part I - Script Type Overview
Part II - EdgeTX Lua API Programming Guide
Lua Basics
Loading Code Modules Dynamically
Saving Memory
Using Key and Touch Events
Drawing Flags and Colors
Data Exchange with the EdgeTX Model Setup
Included Lua Libraries
io Library
io.open()
io.close()
io.read()
io.write()
io.seek()
Part III - EdgeTX Lua API Reference
Part IV - Advanced Topics
Appendix
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io.read()
The io.read() function is used to read data from the file on SD card.
Notice: other read commands (like "all", etc..) are *not supported.

Parameters

  • file object a file object that was returned by the io.open() function. The file must be opened in read mode.
  • length number of characters/bytes to read. The number of actual read/returned characters can be less if the file end is reached.

Return value

  • <string> a string with a length equal or less than
  • "" a zero length string if the end of file was reached
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Parameters
Return value