blob: 3c2286c1324b9f88dc3e188e3c6ae73385ec4959 [file] [log] [blame]
#!/usr/bin/lua
--
-- example_00.lua
-- ~~~~~~~~~~~~~~
-- Version: 0.2 2012-06-01
-- ------------------------------------------------------------------------- --
-- Copyright (c) 2011-2012 Geekscape Pty. Ltd.
-- All rights reserved. This program and the accompanying materials
-- are made available under the terms of the Eclipse Public License v1.0
-- which accompanies this distribution, and is available at
-- http://www.eclipse.org/legal/epl-v10.html
--
-- Contributors:
-- Andy Gelme - Initial implementation
-- -------------------------------------------------------------------------- --
--
-- Description
-- ~~~~~~~~~~~
-- Subscribe to a topic and publish all received messages on another topic.
--
-- ToDo
-- ~~~~
-- - On failure, automatically reconnect to MQTT server.
-- - Error handling: MQTT.client.connect()
-- - Error handling: MQTT.client.destroy()
-- - Error handling: MQTT.client.disconnect()
-- - Error handling: MQTT.client.handler()
-- - Error handling: MQTT.client.publish()
-- - Error handling: MQTT.client.subscribe()
-- - Error handling: MQTT.client.unsubscribe()
-- ------------------------------------------------------------------------- --
function callback(
topic, -- string
message) -- string
print("Topic: " .. topic .. ", message: '" .. message .. "'")
mqtt_client:publish(args.topic_p, message)
end
-- ------------------------------------------------------------------------- --
function is_openwrt()
return(os.getenv("USER") == "root") -- Assume logged in as "root" on OpenWRT
end
-- ------------------------------------------------------------------------- --
if (not is_openwrt()) then require("luarocks.require") end
local lapp = require("pl.lapp")
args = lapp [[
Subscribe to topic_s and publish all messages on topic_p
-H,--host (default localhost) MQTT server hostname
-i,--id (default example_00) MQTT client identifier
-p,--port (default 1883) MQTT server port number
-s,--topic_s (default test/1) Subscribe topic
-t,--topic_p (default test/2) Publish topic
]]
local MQTT = require("mqtt_library")
mqtt_client = MQTT.client.create(args.host, args.port, callback)
mqtt_client:connect(args.id)
mqtt_client:subscribe({ args.topic_s })
local error_message = nil
while (error_message == nil) do
error_message = mqtt_client:handler()
socket.sleep(1.0) -- seconds
end
if (error_message == nil) then
mqtt_client:unsubscribe({ args.topic_s })
mqtt_client:destroy()
else
print(error_message)
end
-- ------------------------------------------------------------------------- --