TinyGo: Getting the upper hen (GopherConUK 2022)

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TinyGo: Getting the upper hen GopherCon UK, London - 17 August 2022 Donia Chaiehloudj Powder @doniacld

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My ideal hen house 01 What is TinyGo? What’s the plan? Demo time Things I learned 02 03 04 05 06 What’s next?

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MY IDEAL HEN HOUSE 01. My ideal hen house ● Monitor my hen house ○ temperature ○ humidity ● Visualise the metrics

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THE GOAL 01. My ideal hen house

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— TinyGo website at tinygo.org TinyGo is a compiler for the Go programming language but for smaller kinds of systems.

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SMALL SYSTEMS 02. What is TinyGo? ● Microcontrollers (86 boards) ● WebAssembly ● Tiny CLI

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TINYGO COMPILER: HISTORY https://aykevl.nl/ 02. What is TinyGo? Ayke exploring existing projects 01/02/19 TinyGo 0.1 TinyGo used by the industry TinyGo adopted by users for side projects 03/02/19 FOSDEM @aurelievache

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TINYGO COMPILER: ANOTHER GO COMPILER The LLVM Project is a collection of modular and reusable compilers. https://tinygo.org/docs/concepts/compiler-internals/pipeline/ 02. What is TinyGo?

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GO VS TINYGO: HELLO WORLD SIZE ❯ go build -o bin/helloworld-go hello/hello_world.go ❯ tinygo build -o bin/helloworld-tinygo hello/hello_world.go ❯ ll bin/ total 5120 -rwxr-xr-x 1 doniacld staff 1.8M Aug 14 18:40 helloworld-go -rwxr-xr-x 1 doniacld staff 29K Aug 14 18:41 helloworld-tinygo go version go1.18.5 darwin/arm64 0.24.0 darwin/amd64 (using go version go1.18.5 and LLVM version 14.0.0) 02. What is TinyGo?

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GO VS TINYGO: GO LANGUAGE FEATURES 02. What is TinyGo? Concurrency ✅ Concurrency != Parallelism Reﬂection 󰠼 Marshal structure with json ﬁelds doesn't work Garbage Collection ✅ -gc=none, -gc=leaking, -gc=conservative Standard libraries 󰠼 Packages supported by TinyGo e.g.: net/http 🎯 Compatibility with Go ecosystem

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FLASH COMMAND tinygo flash -target= .go 1. Compiles the program on your computer 2. Writes it on chip memory (ROM) 3. Runs it on the chip NB: Built-in led is blinking while writing 02. What is TinyGo?

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LET’S DEBUG 02. What is TinyGo?

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DEBUGGING TOOLS ❯ ll /dev/tty.* 02. What is TinyGo? Serial port: connector by which a device sends data one bit at a time.

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https://github.com/doniacld/tinygo-discovery/blob/main/hello/hello_gophers.go https://github.com/doniacld/tinygo-discovery/blob/main/utils/read_serial.go READ FROM THE SERIAL PORT 02. What is TinyGo? ❯ go run hello_gophers.go 2022/08/14 18:23:14 Hi London! What's up GopherCon UK 2022? 2022/08/14 18:23:15 Hi London! What's up GopherCon UK 2022? ❯ go run utils/read_serial.go -port /dev/cu.usbmodem1401 1970/01/01 00:00:03 Hi London! What's up GopherCon UK 2022? 1970/01/01 00:00:04 Hi London! What's up GopherCon UK 2022?

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DEBUGGING TOOLS 02. What is TinyGo? TinyGo built-in debugging tool for binary on chip ● based on gdb ● debug probes not included on every board ● observe scheduler $ tinygo gdb -target=microbit examples/microbit-blink [...] target halted due to debug-request, current mode: Thread xPSR: 0xc1000000 pc: 0x0000071c msp: 0x20000800 (gdb) continue Continuing. ...

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ELECTRICAL CIRCUIT 03. What’s the plan? Arduino Nano 33 IoT DHT22 DATA GROUND VCC

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THE BIG PICTURE 03. What’s the plan?

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PRODUCTION ENVIRONMENT 03. What’s the plan?

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USEFUL TINYGO PACKAGES https://github.com/doniacld/tinygo-discovery/blob/main/tiny-hen/main.go 03. What’s the plan?

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MEASUREMENT PSEUDO CODE https://github.com/doniacld/tinygo-discovery/blob/main/tiny-hen/main.go 03. What’s the plan?

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THE GOOD OLD GO WEB SERVER https://xkcd.com/910/ 03. What’s the plan?

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GO WEB SERVER: PROMETHEUS GAUGE DEFINITIONS https://github.com/doniacld/tiny-hen/blob/main/cmd/prommetric/metric.go 03. What’s the plan?

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INFRASTRUCTURE 03. What’s the plan?

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Demo time https://tinyurl.com/gopher-praying-sticker

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TINYGO CHEAT SHEET 05. Things I learned ● TinyGo: Go compiler for small places ● Flash: tinygo flash -target= main.go ● TinyGo drivers examples are a treasure chest 💎 ● Hardware recommendations: samd21/samd51 board, or an rp2040 or TinyGo Playground ● You can enter the IoT world with your current skills and your IDE ○ VS code plugin ○ GoLand plugin

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WHAT’S NEXT? ● Use async protocol (MQTT) ● Long range WiFi board (LoRaWAN) ● Deploy in the cloud ● Add a fox detection system https://tinyurl.com/gopher-far-west-sticker 06. What’s next?

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https://github.com/doniacld/tinygo-discovery https://github.com/doniacld/tiny-hen @doniacld THANK YOU 🐣

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RESOURCES @doniacld ● TinyGo doc ● Go doc ● TinyGo discovery examples repository ● TinyHen project repository ● Kube stack prometheus doc ● Grafana dashboards Kubernetes