Having achieved some basic success in getting an ESP8266-01 to connect to IBM IoT and NodeRED I decided (as hinted at at the end of my last blog post) to look at linking it with one of my Arduino Nano's so I could have access to a lot more GPIO's.

Installing Gateway Software The standard ESP8266 Gateway sketch can be used without modification (except for SSID & password). Setting things up • Install Arduino IDE 1.6.5+ • Add support for ESP8266 to Arduino, see • Install the latest MySensors library from the Library Manager.

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• Install CP2102 drivers. • Connect NodeMCU board. Compiling and uploading the gateway sketch • Open the WiFi gateway in the Arduino IDE (File -> Sketchbook -> Libraries -> MySensors -> Esp8266Gateway • Save it, to allow editing • Enter your SSID and WiFi password in the 'ssid' and 'pass' variables • Select the ESP8266 board you're targeting in Tools -> Board. Use an ESP12 module, which is a 'NodeMCU 1.0 (ESP 12E module)' board target.

• Verify your sketch. It should compile without errors. • Now upload the sketch. This NodeMCU board normally can be flashed automatically and shouldn't need bootload/reset buttons to be pressed. If you see error, try changing baudrate from from 9600 to 57600. Still problems? Hold flash and press reset.

Start upload in IDE while keeping flash-button pressed until upload starts. • Open the serial console and watch the board connecting to your WiFi network. • Note the IP address assigned to it. Optionally, enable a static ip in your DHCP server if you prefer to keep same ip at the next startup. • Any application capable of communicating with the regular MySensors Ethernet gateway should be able to communicate with the ESP Gateway • Enjoy!

To verify things you can connect a telnet session (e.g. Putty) to the IP address mentioned in the serial output, port 5003 and send some serial commands! Wiring for 'barebone' ESP8266 The 'barebone' ESP modules, like ESP-12E, require a certain pin configuration to download code, and another one to run code. • Connect REST (reset) via 10K pullup resistor to VCC, and via switch to GND ('reset switch') • Connect GPIO15 via 10K pulldown resistor to GND • Connect CH_PD via 10K resistor to VCC • Connect GPIO2 via 10K resistor to VCC • Connect GPIO0 via 10K resistor to VCC, and via switch to GND ('bootload switch') Configuration See for more about inclusion button and leds.

ESP8266Gateway Example.

We can program NodeMCU (ESP8266) in several ways. Most of the times I use it with lua (with nodemcu firmware inside it). We can also program NodeMCU hardware using Arduino IDE. We have already seen how to program NodeMCU from Arduino IDE in this. In this post we will see how to connect NodeMCU with a MQTT broker. We will also learn how to send messages to MQTT broker from NodeMCU and how to receive messages from MQTT broker. Arduino: Connecting NodeMCU To MQTT Broker Environment requirements: • you need to have a NodeMCU (any ESP8266 module would do) • • Arduino libraries: PubSubClient,ArduinoJson (if you haven’t already installed it, you can install it from Sketch->Include library->Manage Libraries) •, if you don’t have one you can use broker for experimentation (host: iot.eclipse.org, port: 1883, it is a free and open broker.