Asynchronous Lua scripts

myGPIOd reads on startup the folder defined by lua_async_dir. Each file with the extension .lua is loaded and registered as Lua file. This files can be called with the lua_async action.

Note

These Lua scripts are executed in a new thread and therefore do not have access to data structures from the main thread. Use this type of scripts for longer running actions.

Custom lua functions

myGPIOd registers custom lua functions to provide access to the actions. The functions return true on success, else false as first value.

Lua function	Description
local rc = gpioBlink({GPIO}, {timeout_ms}, {interval_ms})	Toggle the value of the GPIO in given timeout and interval.
local rc, value = gpioGet({GPIO})	Returns the GPIO state: active, inactive or error
local rc = gpioSet({GPIO}, {active|inactive})	Sets the state of an output GPIO.
local rc = gpioToggle({GPIO})	Toggles the state of an output GPIO.
local rc, resp_header, resp_body = http({method}, {uri}, {content-type}, {postdata})	Submits a HTTP request and waits for the response. Set content-type and postdata to nil if no body should be sent. Valid HTTP methods are: DELETE, GET, HEAD, OPTIONS, PATCH, POST, PUT
local rc, value = inputEvGet({device}, {code})	Returns the current value of tracked input event.
local rc, value = mpc({mpd protocol command})	Runs a mpd protocol command and returns the output.
local rc, resp_header, resp_body = mympd({uri}, {partition}, {script})	Calls the myGPIOd api to execute a script and waits for the response.
local rc, output = system({command})	Executes an executable or script and returns the output.

Example lua file

local rc, resp_header, resp_body = http("GET", "http://test.lan/", nil, nil)
print(resp_body)