How to Send Extrinsic from ESP32

Send Datalog extrinsic in Robonomics Network on ESP32 using robonomics-client-cpp. The code of the demo you can find here.

Requirements

• Platformio core (installation instructions).
• Any serial client for your OS (tio for Linux, for example). You can install tio with the following command

sudo apt install tio

Installation

Clone the repo:

git clone https://github.com/LoSk-p/esp32-datalog-demo.git

Configuration

Create file Private.h in src folder with the following content:

#pragma once

// Set up real keys and addresses instead of dummy values
#define PRIV_KEY ""

#define SS58_ADR ""

// WiFi
#ifndef STASSID
#define STASSID ""
#define STAPSK  ""
#endif

and fill it with the information about your Robonomics account and WiFi Network. PRIV_KEY is the private key of your Robonomics account, SS58_ADR is its address.

This demo works only for ED25519 accounts!

To get the private key from your account seed phrase you can use get-private-key.py script. Just run it and follow instructions:

python3 get-private-key.py

Upload

Connect ESP32 to the computer using USB cable and build the project:

cd esp32-datalog-demo
platformio run -t upload

This command will build binary files for esp and upload them, so in the end you will see following

Writing at 0x000b9def... (84 %)
Writing at 0x000bf4c2... (87 %)
Writing at 0x000c56bf... (90 %)
Writing at 0x000cc6df... (93 %)
Writing at 0x000d1dec... (96 %)
Writing at 0x000d71b0... (100 %)
Wrote 836160 bytes (538555 compressed) at 0x00010000 in 12.2 seconds (effective 548.7 kbit/s)...
Hash of data verified.

Leaving...
Hard resetting via RTS pin...
=========================== [SUCCESS] Took 24.08 seconds ===========================

Run

After uploading reconnect ESP to the computer aand run your Serial Client (tio with the port /dev/ttyACM0 in this example):

tio /dev/ttyACM0

And write the text for Datalog record extrinsic.

You can find out the port in the logs arter platformio run -t upload command in the previous section. Look for something like this:

Auto-detected: /dev/ttyACM0
Uploading .pio/build/nodemcu-32s/firmware.bin
esptool.py v4.5.1
Serial port /dev/ttyACM0
Connecting.......