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esp-idf/examples/protocols/mqtt/tcp
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David Cermak a18d019fc9 lwip: Fix lwiopts macro expansion and dhcps-test 
Minor issue in lwipopts.h in macro expansion in parameters (cosmetic
change: it expands correctly but doesn't pass the expected argument)
Fix lwip thread safety issue in tests: dhcp server should be started and
stopped only in lwip context/thread. Without this fix, the test would
fail if `CONFIG_LWIP_CHECK_THREAD_SAFETY=y`
Adds CONFIG_LWIP_TCPIP_CORE_LOCKING=y to some mqtt example tests (the
same configs as used in v5.1)
2023-03-21 11:21:07 +01:00
..
main build system: re-add -Wno-format as private flag for some example components 2022-08-03 16:42:47 +04:00
CMakeLists.txt tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
mqtt_tcp_example_test.py CI: make sure that reading of the ipv4 address has finished 2022-07-15 14:21:39 +08:00
README.md docs: changes docs supported targets tables 2022-07-14 08:26:32 +08:00
sdkconfig.ci lwip: Fix lwiopts macro expansion and dhcps-test 2023-03-21 11:21:07 +01:00

README.md

Supported Targets ESP32 ESP32-C3 ESP32-S2 ESP32-S3

ESP-MQTT sample application

(See the README.md file in the upper level 'examples' directory for more information about examples.)

This example connects to the broker URI selected using idf.py menuconfig (using mqtt tcp transport) 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)

Note: If the URI equals FROM_STDIN then the broker address is read from stdin upon application startup (used for testing)

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 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) MQTT_EXAMPLE: MQTT_EVENT_CONNECTED
I (4174) MQTT_EXAMPLE: sent publish successful, msg_id=41464
I (4174) MQTT_EXAMPLE: sent subscribe successful, msg_id=17886
I (4174) MQTT_EXAMPLE: sent subscribe successful, msg_id=42970
I (4184) MQTT_EXAMPLE: sent unsubscribe successful, msg_id=50241
I (4314) MQTT_EXAMPLE: MQTT_EVENT_PUBLISHED, msg_id=41464
I (4484) MQTT_EXAMPLE: MQTT_EVENT_SUBSCRIBED, msg_id=17886
I (4484) MQTT_EXAMPLE: sent publish successful, msg_id=0
I (4684) MQTT_EXAMPLE: MQTT_EVENT_SUBSCRIBED, msg_id=42970
I (4684) MQTT_EXAMPLE: sent publish successful, msg_id=0
I (4884) MQTT_CLIENT: deliver_publish, message_length_read=19, message_length=19
I (4884) MQTT_EXAMPLE: MQTT_EVENT_DATA
TOPIC=/topic/qos0
DATA=data
I (5194) MQTT_CLIENT: deliver_publish, message_length_read=19, message_length=19
I (5194) MQTT_EXAMPLE: MQTT_EVENT_DATA
TOPIC=/topic/qos0
DATA=data