mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
4778d9b477
- Disable Kconfig option for Wifi if not supported by the SoC - Enable building mqtt examples when target is set to esp32h2
74 lines
3.5 KiB
Markdown
74 lines
3.5 KiB
Markdown
| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-S2 | ESP32-S3 |
|
|
| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- | -------- |
|
|
|
|
# ESP-MQTT MQTT over WSS Sample application
|
|
(See the README.md file in the upper level 'examples' directory for more information about examples.)
|
|
|
|
This example connects to the broker mqtt.eclipseprojects.io over secure websockets and as a demonstration subscribes/unsubscribes and send a message on certain topic.
|
|
(Please note that the public broker is maintained by the community so may not be always available, for details please see this [disclaimer](https://iot.eclipse.org/getting-started/#sandboxes))
|
|
|
|
It uses ESP-MQTT library which implements mqtt client to connect to mqtt broker.
|
|
|
|
## How to use example
|
|
|
|
### Hardware Required
|
|
|
|
This example can be executed on any ESP32 board, the only required interface is WiFi and connection to internet.
|
|
|
|
### Configure the project
|
|
|
|
* Open the project configuration menu (`idf.py menuconfig`)
|
|
* Configure Wi-Fi or Ethernet under "Example Connection Configuration" menu. See "Establishing Wi-Fi or Ethernet Connection" section in [examples/protocols/README.md](../../README.md) for more details.
|
|
|
|
Note how to create a PEM certificate for mqtt.eclipseprojects.io:
|
|
|
|
PEM certificate for this example could be extracted from an openssl `s_client` command connecting to mqtt.eclipseprojects.io.
|
|
In case a host operating system has `openssl` and `sed` packages installed, one could execute the following command to download and save the root certificate to a file (Note for Windows users: Both Linux like environment or Windows native packages may be used).
|
|
```
|
|
echo "" | openssl s_client -showcerts -connect mqtt.eclipseprojects.io:443 | sed -n "1,/Root/d; /BEGIN/,/END/p" | openssl x509 -outform PEM >mqtt_eclipse_org.pem
|
|
```
|
|
Please note that this is not a general command for downloading a root certificate for an arbitrary host;
|
|
this command works with mqtt.eclipseprojects.io as the site provides root certificate in the chain, which then could be extracted
|
|
with text operation.
|
|
|
|
### Build and Flash
|
|
|
|
Build the project and flash it to the board, then run monitor tool to view serial output:
|
|
|
|
```
|
|
idf.py -p PORT flash monitor
|
|
```
|
|
|
|
(To exit the serial monitor, type ``Ctrl-]``.)
|
|
|
|
See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
|
|
|
|
## Example Output
|
|
|
|
```
|
|
I (3714) event: sta ip: 192.168.0.139, mask: 255.255.255.0, gw: 192.168.0.2
|
|
I (3714) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
|
|
I (3964) MQTT_CLIENT: Sending MQTT CONNECT message, type: 1, id: 0000
|
|
I (4164) MQTTWSS_EXAMPLE: MQTT_EVENT_CONNECTED
|
|
I (4174) MQTTWSS_EXAMPLE: sent publish successful, msg_id=41464
|
|
I (4174) MQTTWSS_EXAMPLE: sent subscribe successful, msg_id=17886
|
|
I (4174) MQTTWSS_EXAMPLE: sent subscribe successful, msg_id=42970
|
|
I (4184) MQTTWSS_EXAMPLE: sent unsubscribe successful, msg_id=50241
|
|
I (4314) MQTTWSS_EXAMPLE: MQTT_EVENT_PUBLISHED, msg_id=41464
|
|
I (4484) MQTTWSS_EXAMPLE: MQTT_EVENT_SUBSCRIBED, msg_id=17886
|
|
I (4484) MQTTWSS_EXAMPLE: sent publish successful, msg_id=0
|
|
I (4684) MQTTWSS_EXAMPLE: MQTT_EVENT_SUBSCRIBED, msg_id=42970
|
|
I (4684) MQTTWSS_EXAMPLE: sent publish successful, msg_id=0
|
|
I (4884) MQTT_CLIENT: deliver_publish, message_length_read=19, message_length=19
|
|
I (4884) MQTTWSS_EXAMPLE: MQTT_EVENT_DATA
|
|
TOPIC=/topic/qos0
|
|
DATA=data
|
|
I (5194) MQTT_CLIENT: deliver_publish, message_length_read=19, message_length=19
|
|
I (5194) MQTTWSS_EXAMPLE: MQTT_EVENT_DATA
|
|
TOPIC=/topic/qos0
|
|
DATA=data
|
|
```
|
|
|
|
|
|
|