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ESP32-IDF_Temperture-Node-v2/managed_components/espressif__mqtt/examples/ws/README.md
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| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 |
| ----------------- | ----- | -------- | -------- | -------- | -------- | --------- | -------- | -------- | -------- | -------- |
# ESP-MQTT MQTT over Websocket
(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 web sockets 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.
### 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) MQTTWS_EXAMPLE: MQTT_EVENT_CONNECTED
I (4174) MQTTWS_EXAMPLE: sent publish successful, msg_id=41464
I (4174) MQTTWS_EXAMPLE: sent subscribe successful, msg_id=17886
I (4174) MQTTWS_EXAMPLE: sent subscribe successful, msg_id=42970
I (4184) MQTTWS_EXAMPLE: sent unsubscribe successful, msg_id=50241
I (4314) MQTTWS_EXAMPLE: MQTT_EVENT_PUBLISHED, msg_id=41464
I (4484) MQTTWS_EXAMPLE: MQTT_EVENT_SUBSCRIBED, msg_id=17886
I (4484) MQTTWS_EXAMPLE: sent publish successful, msg_id=0
I (4684) MQTTWS_EXAMPLE: MQTT_EVENT_SUBSCRIBED, msg_id=42970
I (4684) MQTTWS_EXAMPLE: sent publish successful, msg_id=0
I (4884) MQTT_CLIENT: deliver_publish, message_length_read=19, message_length=19
I (4884) MQTTWS_EXAMPLE: MQTT_EVENT_DATA
TOPIC=/topic/qos0
DATA=data
I (5194) MQTT_CLIENT: deliver_publish, message_length_read=19, message_length=19
I (5194) MQTTWS_EXAMPLE: MQTT_EVENT_DATA
TOPIC=/topic/qos0
DATA=data
```