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Both the OpenEEW Node and the Grillo Pro Node are programmed with the latest OpenEEW firmware.

Latest community firmware

Connect to the OpenEEW Cloud

We encourage you to use the firmware that comes with your device and connect it to the OpenEEW Cloud. This way you can contribute your data to a global EEW system.

However if you wish to simply connect your device to a local server please read on.

Connect to a local MQTT broker

This example requires installation of the MQTT broker on any hardware (cloud, server, laptop, rasperry pi, etc), and then configuration of the device’s firmware.

Flash a new device

As your device will be connected to a unique endpoint, you must make a small change to its firmware so it knows where to connect to.

Install PlatformIO

Follow this guide to install PlatformIO and VSCode on your machine. PlaformIO offers several benefits to the Arduino IDE, particularly the ability to contain dependencies within a simple folder structure.

Open project

Inside VSCode go to PlaformIO home, which is available on the bottom toolbar, and select Projects, then Open Project. Navigate to the root folder where you cloned this repository and open.


In the config.h file two levels of debugging can be set, first “debug” variable needs to be set true to allow serial communication and only basic status lines are part of the output. Second level is set by making LOG_L2 true, this would give specific output on the WiFi events.

The Sample rate needs to be defined by making true either of the 125Hz or 31.25Hz options.

Change IP to local MQTT endpoint

In the main.cpp file change the ip address to match that of your MQTT broker. You can find the IP of the computer running the MQTT broker using Fing.

Upload to an OpenEEW sensor

Build the project using the check mark on the bottom toolbar, then upload using the arrow button adjacent to it. The IDE should automatically detect the board of your connnected OpenEEW sensor and start to write the new firmware.

Start device

Plug in your sensor to power.

Send local Wifi details

Use the Grillo+ Android or iOS apps to transmit your 2.4Ghz wifi (not 5Ghz) to your sensor device.

Consume data

One method for quickly consuming data is to use mosquitto subscribe and publish commands. Once Mosquitto is installed you can run these commands using the IP address of your MQTT broker:

Subscribe to traces

In a terminal subscribe to all traces:

mosquitto_sub -t "iot-2/evt/+/fmt/json" -h -p 1883 -i "a:5yrusp:mosquitto"

Start publishing

In a separate terminal start the trace sending, setting the Live Data Duration in seconds:

mosquitto_pub -h -t iot-2/cmd/sendacceldata/fmt/json -m {LiveDataDuration:5}

Change sample rate

You can change the sample rate of the device as follows:

mosquitto_pub -h -t iot-2/cmd/samplerate/fmt/json -m {SampleRate:125}


mosquitto_pub -h -t iot-2/cmd/samplerate/fmt/json -m {SampleRate:31}

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