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paul-hyde / mqtt-temperature

This application combines an HTTP server, a DS18B20 temperature sensor module, and an MQTT client to provide temperature readings via MQTT

Repository from Github https://github.compaul-hyde/mqtt-temperatureRepository from Github https://github.compaul-hyde/mqtt-temperature

ds18b20esp-idfesp32mqtt

MQTT Temperature

This application combines an HTTP server, a DS18B20 temperature sensor module, and an MQTT client to provide temperature readings via MQTT. It's developed using the IDF (ESP32 IoT Development Framework).

Configure the Project

Set up the ESP-IDF environment: Make sure you have the ESP-IDF installed and configured. Refer to the ESP-IDF Getting Started Guide for instructions.

Clone the repository: Clone the repository containing the MQTT Temperature application:

git clone https://github.com/mqtt-temperature.git
cd mqtt-temperature

Open the project configuration menu:

idf.py menuconfig

Project Configuration

STA Mode Settings:

  • Provide info about wifi
    • Set WiFi SSID
    • Set WiFi Password

    Note: You can choose not to provide information about your access point in the Project configuration. In this case, the ESP will initialize access point mode, and you will be able to configure it via an HTTP server.

AP Mode Settings:

  • Set WiFi SSID
  • Set WiFi Password

MQTT Settings:

  • Set Broker URI

DS18B20 Settings:

  • Set DS18B20 GPIO

sdkconfig contains minimal system settings without which the ESP can't run normally:

  • ESP_MAIN_TASK_STACK_SIZE from 3584 (default value) to 4096. Stack overflow may happen if there are many large buffers on the stack.
  • HTTPD_MAX_REQ_HDR_LEN from 512 (default value) to 1024. Some browsers may have long header fields, causing errors.
  • PARTITION_TABLE_TWO_OTA from n (default value) to y for OTA updates.
  • ESPTOOLPY_FLASHSIZE from 2MB (default value) to 4MB to flash the application.

Build and Flash

Build the project and flash it to the board, then run the monitor tool to view serial output:

idf.py -p PORT flash monitor

(To exit the serial monitor, type Ctrl-].)

Project supports OTA via HTTP server (see HTTP endpoints).

HTTP Endpoints

GET /:

  • Returns index.html.

POST /init/sta:

  • Initialize station mode with current options.

POST /init/mqtt:

  • Connects to MQTT broker with current options.

POST /set_options/sta:

  • Takes settings from the query string and assigns it to station mode configuration. Query string should have the following keys:
    • ssid: access point SSID (network name).
    • password: access point password (WPA or WPA2).
    • max_retry: max retries to connect to access point.
    • auth_mode: Wi-Fi authentication mode threshold.
    • sae_mode: select mode for SAE as Hunt and Peck, H2E, or both.
    • password_id: password identifier for SAE H2E.

POST /set_options/mqtt:

  • Takes settings from the query string and assigns it to MQTT client configuration. Query string should have the following keys:
    • uri: URI of the broker to connect to.

POST /ota_update:

  • Takes firmware binary file, writes it to the boot partition and reboots.

Curl Usage Examples

curl -X POST "http://espserver/init/sta"

curl -X POST "http://espserver/init/mqtt"

curl -X POST "http://espserver/set_options/sta?ssid=myssid&password=mypassword&max_retry=5&auth_mode=wpa2_psk&sae_mode=both&password_id="

curl -X POST "http://espserver/set_options/mqtt?uri=mqtt://mqtt.eclipseprojects.io"

curl --progress-bar -X POST --data-binary @build/mqtt_temperature.bin "http://espserver/ota_update" | tee /dev/null

Example Output

I (678) aug wifi: Initializing wifi needed resources
I (688) aug wifi sta mode: Initializing wifi-STA resources
I (698) wifi:wifi driver task: 3ffc25d0, prio:23, stack:6656, core=0
I (728) wifi:wifi firmware version: cc1dd81
I (728) wifi:wifi certification version: v7.0
I (728) wifi:config NVS flash: enabled
I (728) wifi:config nano formating: disabled
I (738) wifi:Init data frame dynamic rx buffer num: 32
I (738) wifi:Init static rx mgmt buffer num: 5
I (748) wifi:Init management short buffer num: 32
I (748) wifi:Init dynamic tx buffer num: 32
I (748) wifi:Init static rx buffer size: 1600
I (758) wifi:Init static rx buffer num: 10
I (758) wifi:Init dynamic rx buffer num: 32
I (768) wifi_init: rx ba win: 6
I (768) wifi_init: tcpip mbox: 32
I (768) wifi_init: udp mbox: 6
I (778) wifi_init: tcp mbox: 6
I (778) wifi_init: tcp tx win: 5760
I (788) wifi_init: tcp rx win: 5760
I (788) wifi_init: tcp mss: 1440
I (788) wifi_init: WiFi IRAM OP enabled
I (798) wifi_init: WiFi RX IRAM OP enabled
I (808) phy_init: phy_version 4791,2c4672b,Dec 20 2023,16:06:06
I (888) wifi:mode : sta (d4:8a:fc:c7:12:28)
I (888) wifi:enable tsf
I (888) aug wifi sta mode: Waiting for connection
I (888) aug wifi sta mode: Trying to connect to the AP...
I (908) wifi:new:<11,2>, old:<1,0>, ap:<255,255>, sta:<11,2>, prof:1
I (908) wifi:state: init -> auth (b0)
I (918) wifi:state: auth -> assoc (0)
I (918) wifi:state: assoc -> run (10)
I (938) wifi:connected with testssid, aid = 4, channel 11, 40D, bssid = 13:cc:19:09:bc:5a
I (938) wifi:security: WPA2-PSK, phy: bgn, rssi: -80
I (938) wifi:pm start, type: 1

I (938) wifi:dp: 1, bi: 102400, li: 3, scale listen interval from 307200 us to 307200 us
I (998) wifi:AP's beacon interval = 102400 us, DTIM period = 1
I (6948) esp_netif_handlers: sta ip: 192.168.0.115, mask: 255.255.255.0, gw: 192.168.0.1
I (6948) aug wifi sta mode: Got ip:192.168.0.115
I (6948) aug wifi sta mode: Connected to ap SSID:testssid password:testpassword
I (6958) DS18B20S: initializing DS18B20
I (6968) gpio: GPIO[23]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
I (6968) gpio: GPIO[23]| InputEn: 1| OutputEn: 1| OpenDrain: 1| Pullup: 1| Pulldown: 0| Intr:0
I (6978) DS18B20S: 1-Wire bus installed on GPIO23
I (6988) DS18B20S: Device iterator created, start searching...
I (7108) DS18B20S: Found a DS18B20[0], address: 5A031761DE3DFF28
I (7108) DS18B20S: Max DS18B20 number reached, stop searching...
I (7108) DS18B20S: Searching done, 1 DS18B20 device(s) found
I (7118) http server: Starting server on port: '80'
I (7128) http server: Registering set options sta handler
I (7128) http server: Registering init sta handler
I (7128) http server: Registering set options mqtt handler
I (7138) http server: Registering init mqtt handler
I (7148) http server: Registering ota update handler
I (7148) http server: Registering restart handler
I (7158) http server: Registering index handler
I (7158) mqtt client: Initializing mqtt client
I (7168) mqtt client: Other event id:7
I (7358) wifi:<ba-add>idx:0 (ifx:0, 13:cc:19:09:bc:5a), tid:0, ssn:0, winSize:64
I (7398) mqtt client: MQTT_EVENT_CONNECTED
I (37988) mqtt client: Sent publish successful, msg_id=0, topic=/devices/rtl-esp-wroom44[1]/controls/temperature/meta/type, data=temperature
I (37998) mqtt client: Sent publish successful, msg_id=0, topic=/devices/rtl-esp-wroom44[1]/controls/temperature/meta/readonly, data=1
I (38008) mqtt client: Sent publish successful, msg_id=0, topic=/devices/rtl-esp-wroom44[1]/controls/temperature, data=27.19

About

This application combines an HTTP server, a DS18B20 temperature sensor module, and an MQTT client to provide temperature readings via MQTT

ds18b20esp-idfesp32mqtt

License:MIT License

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