mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
113 lines
3.2 KiB
ReStructuredText
113 lines
3.2 KiB
ReStructuredText
ESP-MQTT
|
|
========
|
|
|
|
Overview
|
|
--------
|
|
|
|
ESP-MQTT is an implementation of MQTT protocol client (MQTT is a lightweight publish/subscribe messaging protocol).
|
|
|
|
|
|
Features
|
|
--------
|
|
* supports MQTT over TCP, SSL with mbedtls, MQTT over Websocket, MQTT over Websocket Secure.
|
|
* Easy to setup with URI
|
|
* Multiple instances (Multiple clients in one application)
|
|
* Support subscribing, publishing, authentication, will messages, keep alive pings and all 3 QoS levels (it should be a fully functional client).
|
|
|
|
|
|
Application Example
|
|
-------------------
|
|
|
|
* :example:`protocols/mqtt/tcp`: MQTT over tcp, default port 1883
|
|
* :example:`protocols/mqtt/ssl`: MQTT over tcp, default port 8883
|
|
* :example:`protocols/mqtt/ws`: MQTT over Websocket, default port 80
|
|
* :example:`protocols/mqtt/wss`: MQTT over Websocket Secure, default port 443
|
|
|
|
|
|
Configuration
|
|
-------------
|
|
URI
|
|
^^^
|
|
|
|
- Curently support ``mqtt``, ``mqtts``, ``ws``, ``wss`` schemes
|
|
- MQTT over TCP samples:
|
|
|
|
- ``mqtt://iot.eclipse.org``: MQTT over TCP, default port 1883:
|
|
- ``mqtt://iot.eclipse.org:1884`` MQTT over TCP, port 1884:
|
|
- ``mqtt://username:password@iot.eclipse.org:1884`` MQTT over TCP,
|
|
port 1884, with username and password
|
|
|
|
- MQTT over SSL samples:
|
|
|
|
- ``mqtts://iot.eclipse.org``: MQTT over SSL, port 8883
|
|
- ``mqtts://iot.eclipse.org:8884``: MQTT over SSL, port 8884
|
|
|
|
- MQTT over Websocket samples:
|
|
|
|
- ``ws://iot.eclipse.org:80/ws``
|
|
|
|
- MQTT over Websocket Secure samples:
|
|
|
|
- ``wss://iot.eclipse.org:443/ws``
|
|
|
|
- Minimal configurations:
|
|
|
|
.. code:: c
|
|
|
|
const esp_mqtt_client_config_t mqtt_cfg = {
|
|
.uri = "mqtt://iot.eclipse.org",
|
|
.event_handle = mqtt_event_handler,
|
|
// .user_context = (void *)your_context
|
|
};
|
|
|
|
- If there are any options related to the URI in
|
|
``esp_mqtt_client_config_t``, the option defined by the URI will be
|
|
overridden. Sample:
|
|
|
|
.. code:: c
|
|
|
|
const esp_mqtt_client_config_t mqtt_cfg = {
|
|
.uri = "mqtt://iot.eclipse.org:1234",
|
|
.event_handle = mqtt_event_handler,
|
|
.port = 4567,
|
|
};
|
|
//MQTT client will connect to iot.eclipse.org using port 4567
|
|
|
|
SSL
|
|
^^^
|
|
|
|
- Get certificate from server, example: ``iot.eclipse.org``
|
|
``openssl s_client -showcerts -connect iot.eclipse.org:8883 </dev/null 2>/dev/null|openssl x509 -outform PEM >iot_eclipse_org.pem``
|
|
- Check the sample application: ``examples/mqtt_ssl``
|
|
- Configuration:
|
|
|
|
.. code:: cpp
|
|
|
|
const esp_mqtt_client_config_t mqtt_cfg = {
|
|
.uri = "mqtts://iot.eclipse.org:8883",
|
|
.event_handle = mqtt_event_handler,
|
|
.cert_pem = (const char *)iot_eclipse_org_pem_start,
|
|
};
|
|
|
|
For more options on ``esp_mqtt_client_config_t``, please refer to API reference below
|
|
|
|
Change settings in ``menuconfig``
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
::
|
|
make menuconfig
|
|
-> Component config -> ESP-MQTT Configuration
|
|
|
|
|
|
- :ref:`CONFIG_MQTT_PROTOCOL_311`: Enables 3.1.1 version of MQTT protocol
|
|
|
|
- :ref:`CONFIG_MQTT_TRANSPORT_SSL`, :ref:`CONFIG_MQTT_TRANSPORT_WEBSOCKET`: Enables specific MQTT transport layer, such as SSL, WEBSOCKET, WEBSOCKET_SECURE
|
|
|
|
- :ref:`CONFIG_MQTT_CUSTOM_OUTBOX`: Disables default implementation of mqtt_outbox, so a specific implementaion can be supplied
|
|
|
|
|
|
API Reference
|
|
-------------
|
|
|
|
.. include:: /_build/inc/mqtt_client.inc
|