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Sebastian Bøe 55ee53ce91 cmake: Prepend 'cmake_minimum_required()' into 'app' build scripts 
Prepend the text 'cmake_minimum_required(VERSION 3.8.2)' into the
application and test build scripts.

Modern versions of CMake will spam users with a deprecation warning
when the toplevel CMakeLists.txt does not specify a CMake
version. This is documented in bug #8355.

To resolve this we include a cmake_minimum_required() line into the
toplevel build scripts. Additionally, cmake_minimum_required is
invoked from within boilerplate.cmake. The highest version will be
enforced.

This patch allows us to afterwards change CMake policy CMP000 from OLD
to NEW which in turn finally rids us of the verbose warning.

The extra boilerplate is considered more acceptable than the verbosity
of the CMP0000 policy.

Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
 		2018-08-15 04:06:50 -07:00
..
src net: config: Rename Kconfig options to correspond to library name 2018-08-13 18:42:31 -07:00
CMakeLists.txt cmake: Prepend 'cmake_minimum_required()' into 'app' build scripts 2018-08-15 04:06:50 -07:00
README.rst samples: net: Update compilation instructions for cmake 2017-11-10 11:36:33 -05:00
prj_96b_nitrogen.conf net: config: Rename Kconfig options to correspond to library name 2018-08-13 18:42:31 -07:00
prj_frdm_k64f.conf net: config: Rename Kconfig options to correspond to library name 2018-08-13 18:42:31 -07:00
prj_frdm_k64f_tls.conf net: config: Rename Kconfig options to correspond to library name 2018-08-13 18:42:31 -07:00
prj_qemu_x86.conf net: config: Rename Kconfig options to correspond to library name 2018-08-13 18:42:31 -07:00
sample.yaml samples: bluetooth and net samples need test setup 2017-12-28 20:24:29 -05:00

README.rst 

.. _mqtt-publisher-sample:

MQTT Publisher
##############

Overview
********

`MQTT <http://mqtt.org/>`_ (MQ Telemetry Transport) is a lightweight
publish/subscribe messaging protocol optimized for small sensors and
mobile devices.

The Zephyr MQTT Publisher sample application is a MQTT v3.1.1
client that sends MQTT PUBLISH messages to a MQTT broker.
See the `MQTT V3.1.1 spec`_ for more information.

.. _MQTT V3.1.1 spec: http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/mqtt-v3.1.1.html

The source code of this sample application can be found at:
:file:`samples/net/mqtt_publisher`.

Requirements
************

- Linux machine
- Freedom Board (FRDM-K64F)
- Mosquitto server: any version that supports MQTT v3.1.1. This sample
  was tested with mosquitto 1.3.4.
- Mosquitto subscriber
- LAN for testing purposes (Ethernet)

Build and Running
*****************

Currently, this sample application only supports static IP addresses.
Open the :file:`src/config.h` file and set the IP addresses according
to the LAN environment.
Alternatively, set the IP addresses in the :file:`prj_frdm_k64f.conf` file.

This file :file:`src/config.h` also contains some variables that may be changed:

MQTT broker TCP port:

.. code-block:: c

	#define SERVER_PORT		1883

Application sleep time:

.. code-block:: c

	#define APP_SLEEP_MSECS		500

Application RX and TX timeout:

.. code-block:: c

	#define APP_TX_RX_TIMEOUT       300

Max number of connection tries:

.. code-block:: c

	#define APP_CONNECT_TRIES	10

Max number of MQTT PUBLISH iterations:

.. code-block:: c

	#define APP_MAX_ITERATIONS	5

MQTT Client Identifier:

.. code-block:: c

	#define MQTT_CLIENTID		"zephyr_publisher"

This sample application supports the IBM Bluemix Watson topic format that can
be enabled by changing the default value of APP_BLUEMIX_TOPIC from 0 to 1:

.. code-block:: c

	#define APP_BLUEMIX_TOPIC	1

The Bluemix topic may include some parameters like device type, device
identifier, event type and message format. This application uses the
following macros to specify those values:

.. code-block:: c

	#define BLUEMIX_DEVTYPE		"sensor"
	#define BLUEMIX_DEVID		"carbon"
	#define BLUEMIX_EVENT		"status"
	#define BLUEMIX_FORMAT		"json"

On your Linux host computer, open a terminal window, locate the source code
of this sample application (i.e. :file:`samples/net/mqtt_publisher`) and type:

.. zephyr-app-commands::
   :zephyr-app: samples/net/mqtt_publisher
   :board: frdm_k64f
   :goals: build flash
   :compact:

Open another terminal window and type:

.. code-block:: console

	$ sudo mosquitto -v -p 1883

Open another terminal window and type:

.. code-block:: console

	$ mosquitto_sub -t sensors

Sample output
=============

This is the output from the FRDM UART console, with:

.. code-block:: c

	#define APP_MAX_ITERATIONS     5

.. code-block:: console

	[dev/eth_mcux] [INF] eth_0_init: Enabled 100M full-duplex mode.
	[dev/eth_mcux] [DBG] eth_0_init: MAC 00:04:9f:3e:1a:0a
	[publisher:233] network_setup: 0 <OK>
	[publisher:258] mqtt_init: 0 <OK>
	[connect_cb:81] user_data: CONNECTED
	[try_to_connect:212] mqtt_tx_connect: 0 <OK>
	[publisher:276] try_to_connect: 0 <OK>
	[publisher:285] mqtt_tx_pingreq: 0 <OK>
	[publisher:290] mqtt_tx_publish: 0 <OK>
	[publish_cb:149] <MQTT_PUBACK> packet id: 1888, user_data: PUBLISH
	[publisher:295] mqtt_tx_publish: 0 <OK>
	[publish_cb:149] <MQTT_PUBREC> packet id: 16356, user_data: PUBLISH
	[publish_cb:149] <MQTT_PUBCOMP> packet id: 16356, user_data: PUBLISH
	[publisher:300] mqtt_tx_publish: 0 <OK>
	[publisher:285] mqtt_tx_pingreq: 0 <OK>
	[publisher:290] mqtt_tx_publish: 0 <OK>
	[publish_cb:149] <MQTT_PUBACK> packet id: 45861, user_data: PUBLISH
	[publisher:295] mqtt_tx_publish: 0 <OK>
	[publish_cb:149] <MQTT_PUBREC> packet id: 53870, user_data: PUBLISH
	[publish_cb:149] <MQTT_PUBCOMP> packet id: 53870, user_data: PUBLISH
	[publisher:300] mqtt_tx_publish: 0 <OK>
	[publisher:285] mqtt_tx_pingreq: 0 <OK>
	[publisher:290] mqtt_tx_publish: 0 <OK>
	[publish_cb:149] <MQTT_PUBACK> packet id: 60144, user_data: PUBLISH
	[publisher:295] mqtt_tx_publish: 0 <OK>
	[publish_cb:149] <MQTT_PUBREC> packet id: 6561, user_data: PUBLISH
	[publish_cb:149] <MQTT_PUBCOMP> packet id: 6561, user_data: PUBLISH
	[publisher:300] mqtt_tx_publish: 0 <OK>
	[publisher:285] mqtt_tx_pingreq: 0 <OK>
	[publisher:290] mqtt_tx_publish: 0 <OK>
	[publish_cb:149] <MQTT_PUBACK> packet id: 38355, user_data: PUBLISH
	[publisher:295] mqtt_tx_publish: 0 <OK>
	[publish_cb:149] <MQTT_PUBREC> packet id: 60656, user_data: PUBLISH
	[publish_cb:149] <MQTT_PUBCOMP> packet id: 60656, user_data: PUBLISH
	[publisher:300] mqtt_tx_publish: 0 <OK>
	[publisher:285] mqtt_tx_pingreq: 0 <OK>
	[publisher:290] mqtt_tx_publish: 0 <OK>
	[publish_cb:149] <MQTT_PUBACK> packet id: 28420, user_data: PUBLISH
	[publisher:295] mqtt_tx_publish: 0 <OK>
	[publish_cb:149] <MQTT_PUBREC> packet id: 49829, user_data: PUBLISH
	[publish_cb:149] <MQTT_PUBCOMP> packet id: 49829, user_data: PUBLISH
	[publisher:300] mqtt_tx_publish: 0 <OK>
	[disconnect_cb:101] user_data: DISCONNECTED
	[publisher:304] mqtt_tx_disconnect: 0 <OK>

	Bye!

The line:

.. code-block:: console

	[try_to_connect:220] mqtt_connect: -5 <ERROR>

means that an error was detected and a new connect message will be sent.

The MQTT API is asynchronous, so messages are displayed as the callbacks are
executed.

This is the information that the subscriber will receive:

.. code-block:: console

	$ mosquitto_sub -t sensors
	DOORS:OPEN_QoS0
	DOORS:OPEN_QoS1
	DOORS:OPEN_QoS2
	DOORS:OPEN_QoS0
	DOORS:OPEN_QoS1
	DOORS:OPEN_QoS2
	DOORS:OPEN_QoS0
	DOORS:OPEN_QoS1
	DOORS:OPEN_QoS2
	DOORS:OPEN_QoS0
	DOORS:OPEN_QoS1
	DOORS:OPEN_QoS2
	DOORS:OPEN_QoS0
	DOORS:OPEN_QoS1
	DOORS:OPEN_QoS2

This is the output from the MQTT broker:

.. code-block:: console

	$ sudo mosquitto -v
	1485663791: mosquitto version 1.3.4 (build date 2014-08-17 00:14:52-0300) starting
	1485663791: Using default config.
	1485663791: Opening ipv4 listen socket on port 1883.
	1485663791: Opening ipv6 listen socket on port 1883.
	1485663797: New connection from 192.168.1.101 on port 1883.
	1485663797: New client connected from 192.168.1.101 as zephyr_publisher (c1, k0).
	1485663797: Sending CONNACK to zephyr_publisher (0)
	1485663798: Received PINGREQ from zephyr_publisher
	1485663798: Sending PINGRESP to zephyr_publisher
	1485663798: Received PUBLISH from zephyr_publisher (d0, q0, r0, m0, 'sensors', ... (15 bytes))
	1485663799: Received PUBLISH from zephyr_publisher (d0, q1, r0, m1888, 'sensors', ... (15 bytes))
	1485663799: Sending PUBACK to zephyr_publisher (Mid: 1888)
	1485663799: Received PUBLISH from zephyr_publisher (d0, q2, r0, m16356, 'sensors', ... (15 bytes))
	1485663799: Sending PUBREC to zephyr_publisher (Mid: 16356)
	1485663799: Received PUBREL from zephyr_publisher (Mid: 16356)
	1485663799: Sending PUBCOMP to zephyr_publisher (Mid: 16356)
	1485663800: Received PINGREQ from zephyr_publisher
	1485663800: Sending PINGRESP to zephyr_publisher
	1485663800: Received PUBLISH from zephyr_publisher (d0, q0, r0, m0, 'sensors', ... (15 bytes))
	1485663801: Received PUBLISH from zephyr_publisher (d0, q1, r0, m45861, 'sensors', ... (15 bytes))
	1485663801: Sending PUBACK to zephyr_publisher (Mid: 45861)
	1485663801: Received PUBLISH from zephyr_publisher (d0, q2, r0, m53870, 'sensors', ... (15 bytes))
	1485663801: Sending PUBREC to zephyr_publisher (Mid: 53870)
	1485663801: Received PUBREL from zephyr_publisher (Mid: 53870)
	1485663801: Sending PUBCOMP to zephyr_publisher (Mid: 53870)
	1485663802: Received PINGREQ from zephyr_publisher
	1485663802: Sending PINGRESP to zephyr_publisher
	1485663802: Received PUBLISH from zephyr_publisher (d0, q0, r0, m0, 'sensors', ... (15 bytes))
	1485663803: Received PUBLISH from zephyr_publisher (d0, q1, r0, m60144, 'sensors', ... (15 bytes))
	1485663803: Sending PUBACK to zephyr_publisher (Mid: 60144)
	1485663803: Received PUBLISH from zephyr_publisher (d0, q2, r0, m6561, 'sensors', ... (15 bytes))
	1485663803: Sending PUBREC to zephyr_publisher (Mid: 6561)
	1485663803: Received PUBREL from zephyr_publisher (Mid: 6561)
	1485663803: Sending PUBCOMP to zephyr_publisher (Mid: 6561)
	1485663804: Received PINGREQ from zephyr_publisher
	1485663804: Sending PINGRESP to zephyr_publisher
	1485663804: Received PUBLISH from zephyr_publisher (d0, q0, r0, m0, 'sensors', ... (15 bytes))
	1485663805: Received PUBLISH from zephyr_publisher (d0, q1, r0, m38355, 'sensors', ... (15 bytes))
	1485663805: Sending PUBACK to zephyr_publisher (Mid: 38355)
	1485663805: Received PUBLISH from zephyr_publisher (d0, q2, r0, m60656, 'sensors', ... (15 bytes))
	1485663805: Sending PUBREC to zephyr_publisher (Mid: 60656)
	1485663805: Received PUBREL from zephyr_publisher (Mid: 60656)
	1485663805: Sending PUBCOMP to zephyr_publisher (Mid: 60656)
	1485663806: Received PINGREQ from zephyr_publisher
	1485663806: Sending PINGRESP to zephyr_publisher
	1485663806: Received PUBLISH from zephyr_publisher (d0, q0, r0, m0, 'sensors', ... (15 bytes))
	1485663807: Received PUBLISH from zephyr_publisher (d0, q1, r0, m28420, 'sensors', ... (15 bytes))
	1485663807: Sending PUBACK to zephyr_publisher (Mid: 28420)
	1485663807: Received PUBLISH from zephyr_publisher (d0, q2, r0, m49829, 'sensors', ... (15 bytes))
	1485663807: Sending PUBREC to zephyr_publisher (Mid: 49829)
	1485663807: Received PUBREL from zephyr_publisher (Mid: 49829)
	1485663807: Sending PUBCOMP to zephyr_publisher (Mid: 49829)
	1485663808: Received DISCONNECT from zephyr_publisher