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authorKevin KIN-FOO2014-10-02 10:48:01 -0400
committerKevin KIN-FOO2014-10-03 05:43:14 -0400
commitbe78ecfec4e35ca7981e1093f6fc1a40f01ab56d (patch)
treed44c6291430dfd2813deb4d69d274ab7dcf4ac6a
parent429915a1d62ed54807d596b8e32e2cc6a0f732ed (diff)
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Bug 445785: Update documentation
Signed-off-by: Kevin KIN-FOO <kkinfoo@sierrawireless.com>
-rw-r--r--README.md87
1 files changed, 44 insertions, 43 deletions
diff --git a/README.md b/README.md
index d8de103..d8e1320 100644
--- a/README.md
+++ b/README.md
@@ -182,41 +182,41 @@ The complete functioning code can be viewed here ...
-- Define a function which is called by mqtt_client:handler(),
-- whenever messages are received on the subscribed topics
- function callback(topic, message)
- print("Received: " .. topic .. ": " .. message)
- if (message == "quit") then running = false end
- end
+ function callback(topic, message)
+ print("Received: " .. topic .. ": " .. message)
+ if (message == "quit") then running = false end
+ end
-- Create an MQTT client instance, connect to the MQTT server and
-- subscribe to the topic called "test/2"
- MQTT = require("mqtt_library")
- MQTT.Utility.set_debug(true)
- mqtt_client = MQTT.client.create("localhost", nil, callback)
- mqtt_client:connect("lua mqtt client"))
- mqtt_client:subscribe({"test/2"})
+ MQTT = require "paho.mqtt"
+ MQTT.Utility.set_debug(true)
+ mqtt_client = MQTT.client.create("localhost", nil, callback)
+ mqtt_client:connect("lua mqtt client"))
+ mqtt_client:subscribe({"test/2"})
-- Continously invoke mqtt_client:handler() to process the MQTT protocol and
-- handle any received messages. Also, publish a message on topic "test/1"
- running = true
+ running = true
- while (running) do
- mqtt_client:handler()
- mqtt_client:publish("test/1", "test message")
- socket.sleep(1.0) -- seconds
- end
+ while (running) do
+ mqtt_client:handler()
+ mqtt_client:publish("test/1", "test message")
+ socket.sleep(1.0) -- seconds
+ end
-- Clean-up by unsubscribing from the topic and closing the MQTT connection
- mqtt_client:unsubscribe({"test/2"})
- mqtt_client:destroy()
+ mqtt_client:unsubscribe({"test/2"})
+ mqtt_client:destroy()
There are also a number of Lua MQTT client examples in the _example/_ directory.
They can be run from the _lua/_ parent directory, as follow ...
- cd mqtt_client/lua
- example/example_00.lua
+ cd mqtt_client/paho
+ example/example_00.lua
<a name="api" />
MQTT client Library API
@@ -230,89 +230,89 @@ unsubscribe from one or more topics and disconnect from the MQTT server.
Use the Lua _require_ statement to load the MQTT client library ...
- MQTT = require("mqtt_library")
+ local MQTT = require 'paho.mqtt'
#### MQTT.Utility.set_debug(): Library debug console logging
The following statement enables debug console logging for diagnosis.
- MQTT.Utility.set_debug(true)
+ MQTT.Utility.set_debug(true)
#### MQTT.client.create(): Create an MQTT client instance
Create an MQTT client that will be connected to the specified host.
- mqtt_client = MQTT.client.create(hostname, port, callback)
+ mqtt_client = MQTT.client.create(hostname, port, callback)
The _hostname_ must be provided, but both the _port_ and _callback function_
parameters are optional. This function returns an MQTT client instance
that must be used for all subsequent MQTT operations for that server connection.
- hostname string: Host name or address of the MQTT broker
- port integer: Port number of the MQTT broker (default: 1883)
- callback function: Invoked when subscribed topic messages received
+ hostname string: Host name or address of the MQTT broker
+ port integer: Port number of the MQTT broker (default: 1883)
+ callback function: Invoked when subscribed topic messages received
The _callback function_ is defined as follows ...
- function callback(topic, payload)
+ function callback(topic, payload)
-- application specific code
- end
+ end
- topic -- string: Topic for the received message
- payload -- string: Message data
+ topic -- string: Topic for the received message
+ payload -- string: Message data
#### MQTT.client:destroy(): Destroy an MQTT client instance
When finished with a server connection, this statement cleans-up all resources
allocated by the client.
- mqtt_client:destroy()
+ mqtt_client:destroy()
#### MQTT.client:connect(): Make a connection to an MQTT server
Before messages can be transmitted, the MQTT client must connect to the server.
- mqtt_client:connect(identifier)
+ mqtt_client:connect(identifier)
Each individual client connection must use a unique identifier.
Only the _identifier_ parameter is required, the remaining parameters
are optional.
- mqtt_client:connect(identifier, will_topic, will_qos, will_retain, will_message)
+ mqtt_client:connect(identifier, will_topic, will_qos, will_retain, will_message)
MQTT also provides a "last will and testament" for clients, which is a message
automatically sent by the server on behalf of the client, should the connection
fail.
- identifier -- string: MQTT client identifier (maximum 23 characters)
- will_topic -- string: Last will and testament topic
- will_qos -- byte: Last will and testament Quality Of Service
- will_retain -- byte: Last will and testament retention status
- will_message -- string: Last will and testament message
+ identifier -- string: MQTT client identifier (maximum 23 characters)
+ will_topic -- string: Last will and testament topic
+ will_qos -- byte: Last will and testament Quality Of Service
+ will_retain -- byte: Last will and testament retention status
+ will_message -- string: Last will and testament message
#### MQTT.client:disconnect(): Transmit MQTT Disconnect message
Transmit an MQTT disconnect message to the server.
- mqtt_client:disconnect()
+ mqtt_client:disconnect()
#### MQTT.client:publish(): Transmit MQTT publish message
Transmit a message on a specified topic.
- mqtt_client:publish(topic, payload)
+ mqtt_client:publish(topic, payload)
- topic -- string: Topic for the published message
- payload -- string: Message data
+ topic -- string: Topic for the published message
+ payload -- string: Message data
#### MQTT.client:subscribe(): Transmit MQTT Subscribe message
Subscribe to one or more topics. Whenever a message is published to one of
those topics, the callback function (defined above) will be invoked.
- mqtt_client:subscribe(topics)
+ mqtt_client:subscribe(topics)
- topics -- table of strings, e.g. { "topic1", "topic2" }
+ topics -- table of strings, e.g. { "topic1", "topic2" }
#### MQTT.client:handler(): Handle received messages, maintain keep-alive messages
@@ -338,6 +338,7 @@ topics are no longer received.
<a name="problems" />
Known problems
--------------
+
- Occasional "MQTT.client:handler(): Message length mismatch" errors,
particularly when subscribed topics are transmitting many messages.

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