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PolkaVM Smart Contract Development

This skill covers building, testing, and deploying smart contracts for the Polkadot Asset Hub using PolkaVM (RISC-V based virtual machine).

Environment Overview

• Runtime: PolkaVM (RISC-V based, not EVM)
• Network: Paseo Asset Hub TestNet
• RPC URL: https://testnet-passet-hub-eth-rpc.polkadot.io
• Language: Rust (#![no_std])

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#!/bin/bash

# Print the usage of the script if the SERVER_URL or ADMIN_TOKEN arguments are not provided
if [ -z "$1" ] || [ -z "$2" ]; then
  echo "Usage: $0 SERVER_URL ADMIN_TOKEN"
  exit 1
fi

# Get the SERVER_URL and ADMIN_TOKEN from the command line arguments
SERVER_URL="$1"

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Best practices for maintaining & running substrate-based (para)chain (wip)

• Ensure all of your systems are kept up-to-date, especially with security updates.
• Ensure you can fully bootstrap a new system from scratch easily if needed.
• Upload archive chain backups frequently. Potentially make these available to the community down the road.
• Have database recovery methods in place.
• Use infrastructure as code. Never modify anything manually on your servers.
• Ensure you have a monitoring stack set up WITH alerts (alertmanager/grafana alerts/bots etc).
• Keep alerts actionable, otherwise they become noise.
• If a service crashes, make sure it automatically restarts in some way (via systemd or kubernetes).

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#!/bin/bash
v4l2-ctl --set-ctrl=exposure_auto=1
v4l2-ctl --set-ctrl=white_balance_temperature_auto=0
v4l2-ctl --set-ctrl=exposure_absolute=900
#v4l2-ctl --set-ctrl=contrast=26
v4l2-ctl --set-ctrl=white_balance_temperature=4900

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Using the EZVIZ S6 as a wifi webcam

I bought a cheap EZVIZ S6 "action cam" and wanted to use it as a recorded and/or livestreaming PoV cam.
Ideally, it would be available as a video capture device without an sd card and also a native Linux video device.

So I did it. Here's how you can do it:

Make sure you have a working wifi card and an ethernet connection (because your wifi card will have to connect to the camera, so you need to use ethernet for internet).

Download motion

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{
  "version": "2.0",
  "columns": 2,
  "tiles": [
    {"type": "PORT", "label": "Am I on fire?", "params": {"hostname": "127.0.0.1", "port": 8080}},
    {"type": "HTTP-STATUS", "label": "SSL certificate is valid", "params": { "url": "https://banmebit.ch" }},
    {
      "type": "PING",
      "label": "Localhost",
      "params": { "hostname": "127.0.0.1" }

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#!/bin/bash

MATRIX_SERVER="$2"
USER="$3"
PASSWORD="$4"

curl -XGET "https://$MATRIX_SERVER/_matrix/client/r0/login"
curl -XPOST -d '{"type":"m.login.password", "user":"$USER", "password":"$PASSWORD}' "https://$MATRIX_SERVER/_matrix/client/r0/login"

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#!/bin/bash

# Adjust homserver, room, and accesstoken to your particular setup

msgtype=m.text
homeserver="$2"
room="$3"
accesstoken="$4"

while true; do

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All you need to do is create an image in GIMP which is 160x80 (the Freeside logo is exactly these dimensions when scaled down).

Export this image in RAW format with type BMP.

Add whatever you want to the image and the clock will appear in the top right and the "invisible" battery marker will be in the top right - it will turn black when semi-low and red when low.

Watch time can be set by pressing top right button (may need a long press if it doesn't work right away).

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export opentabs=$(find ~/.mozilla/firefox*/*.default/sessionstore-backups/recovery.jsonlz4);

python3 <<< $'import os, json, lz4.block
f = open(os.environ["opentabs"], "rb")
magic = f.read(8)
jdata = json.loads(lz4.block.decompress(f.read()).decode("utf-8"))
f.close()
last_recent = 0
for win in jdata.get("windows"):
    for tab in win.get("tabs"):