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- Long Range Wireless Mesh Modem with USB Interface
- Arduino IDE
- PubSubClient Library
This library provides a client for doing simple publish/subscribe messaging with a server that supports MQTT
For more information about MQTT, visit mqtt.org.
The latest version of the library can be downloaded from GitHub
The library comes with a number of example sketches. See File > Examples > PubSubClient within the Arduino application.Full API Documentation.
The library uses the Arduino Ethernet Client api for interacting with the underlying network hardware. This means it Just Works with a growing number of boards and shields, including:
- Arduino Ethernet
- Arduino Ethernet Shield
- Arduino YUN – use the included YunClient in place of EthernetClient, and be sure to do a Bridge.begin() first
- Arduino WiFi Shield - if you want to send packets greater than 90 bytes with this shield, enable the MQTT_MAX_TRANSFER_SIZE option in PubSubClient.h.
- SparkFun WiFly Shield – when used with this library
- Intel Galileo/Edison
- ESP32The library cannot currently be used with hardware based on the ENC28J60 chip – such as the Nanode or the Nuelectronics Ethernet Shield. For those, there is an alternative library available.
The Wire library allows you to communicate with I2C devices, often also called "2 wire" or "TWI" (Two Wire Interface), can download from Wire.h
- Wire.begin()Begin using Wire in master mode, where you will initiate and control data transfers. This is the most common use when interfacing with most I2C peripheral chips.
- Wire.begin(address)Begin using Wire in slave mode, where you will respond at "address" when other I2C masters chips initiate communication.
- Wire.beginTransmission(address)Start a new transmission to a device at "address". Master mode is used.
- Wire.write(data)Send data. In master mode, beginTransmission must be called first.
- Wire.endTransmission()In master mode, this ends the transmission and causes all buffered data to be sent.
- Wire.requestFrom(address, count)Read "count" bytes from a device at "address". Master mode is used.
- Wire.available()Retuns the number of bytes available by calling receive.
- Wire.read()Receive 1 byte.
- Before uploading the code you can view the working of this sensor at a given link.
- Download and include the PubSubClient Library and Wire.h Library.