-- obi200_daily_restart.lua
-- This script restarts an obi200 device at a specified time each day

local http = require("socket.http")
local ltn12 = require("ltn12")
local os = require("os")

-- Configuration
local OBI_IP = "192.168.1.124"  -- Replace with your obi200's IP address
local OBI_PASSWORD = "admin"    -- Replace with your obi200's admin password
local RESTART_HOUR = 11          -- Hour to restart (24-hour format)
local RESTART_MINUTE = 30        -- Minute to restart

-- Function to restart the obi200
local function restart_obi200()
    local url = string.format("http://%s/reboot.cgi", OBI_IP)
    local request_body = string.format("page=reboot&password=%s", OBI_PASSWORD)
    
    local response_body = {}
    local request, code, response_headers = http.request{
        url = url,
        method = "POST",
        headers = {
            ["Content-Type"] = "application/x-www-form-urlencoded",
            ["Content-Length"] = #request_body
        },
        source = ltn12.source.string(request_body),
        sink = ltn12.sink.table(response_body)
    }
    
    if code == 200 then
        print("obi200 restart command sent successfully")
    else
        print("Failed to send restart command. HTTP Status: " .. tostring(code))
    end
end

-- Main loop
while true do
    local current_time = os.date("*t")
    
    -- Check if it's time to restart
    if current_time.hour == RESTART_HOUR and current_time.min == RESTART_MINUTE then
        print("It's time to restart the obi200")
        restart_obi200()
        
        -- Wait for 60 seconds to avoid multiple restarts
        os.execute("sleep 60")
    end
    
    -- Wait for 30 seconds before checking again
    os.execute("sleep 30")
end
by

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About Lua

Lua is a light weight embeddable scripting language which is built on top of C. It is used in almost all kind of applications like games, web applications, mobile applications, image processing etc. It's a very powerful, fast, easy to learn, open-source scripting language.

Syntax help

Variables

  • By default all the variables declared are global variables
  • If the variables are explicitly mentioned as local then they are local variables.
  • Lua is a dynamically typed language and hence only the values will have types not the variables.

Examples

-- global variables
a = 10

-- local variables

local x = 30
Value TypeDescription
numberRepresents numbers
stringRepresents text
nilDifferentiates values whether it has data or not
booleanValue can be either true or false
functionRepresents a sub-routine
userdataRepresents arbitary C data
threadRepresents independent threads of execution.
tableCan hold any value except nil

Loops

1. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while(condition)
do
--code
end

2. Repeat-Until:

Repeat-Until is also used to iterate a set of statements based on a condition. It is very similar to Do-While, it is mostly used when you need to execute the statements atleast once.

repeat
   --code
until( condition )

3. For:

For loop is used to iterate a set of statements based on a condition.

for init,max/min value, increment
do
   --code
end

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increase re-usuability and modularity.

optional_function_scope function function_name( argument1, argument2, argument3........, argumentn)
--code
return params with comma seperated
end