danawoodman

How to build a Golang application for a Raspberry Pi

Given a binary at cmd/server/main.go, create a binary at bin/server that is built for a Raspberry Pi:

env GOOS=linux GOARCH=arm GOARM=5 go build -o ./bin/server ./cmd/server/main.go

danawoodman

Using Golang templ with the Echo framework

templ is a great view framework but there is no clear documentation (as of writing) showing how to use it with the Echo web framework. This short guide should show you how to set it up:

Install dependencies

Install templ and echo:

go get github.com/a-h/templ

danawoodman

await run();

async function run() {
  let loop = 0;

  while (true) {
    loop++;
    console.log("loop:", loop);
    const items = get_items();
    if (!items.length) break;

danawoodman

<script lang="ts">
  export let label: string
  export let type: string = "text"
  export let value: string = ""
  export let disabled: boolean = false
  export let validate: (val: string) => boolean
  export let valid: boolean = false

  let id = `field-${Math.floor(Math.random() * 1000)}`

danawoodman

Hello world

This is a test.

• Foo
• Bar
• Baz

Hello

danawoodman

// Lots of examples here:
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array

const arr = [ 1, 2, 3 ]

// first item in array:
arr[0]

// last item:
arr[2]

danawoodman

SUBSYSTEM=="input", GROUP="input", MODE="0666"
SUBSYSTEM=="usb", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="05df", MODE:="666", GROUP="plugdev"
KERNEL=="hidraw*", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="05df", MODE="0666", GROUP="plugdev"

danawoodman

/**
 * Control a USB relay board using USB.
 *
 * This code helped a lot in the understanding of what they boards
 * expect for hex inputs:
 * https://github.com/jaketeater/Very-Simple-USB-Relay/blob/master/relay.py
 */
const HID = require('node-hid')

const ALL_ON = 0xfe

danawoodman

/**
 * Control a USB relay board using USB.
 *
 * This code helped a lot in the understanding of what they boards
 * expect for hex inputs:
 * https://github.com/jaketeater/Very-Simple-USB-Relay/blob/master/relay.py
 */
const HID = require('node-hid')

const ON = 0xfe

danawoodman

import React, { Component } from "react";
import logo from "./logo.svg";
import "./App.css";
import { BrowserRouter as Router, Route, Link } from "react-router-dom";

const COMPANIES = [
  {
    id: 1,
    name: "Foo",
    accounts: [{ id: 4, name: "SubAccount", accounts: [] }]