Monthly Archives: April 2025

Squid unexpectedly stopped working

Squid unexpectedly stopped working with my home internet connection. I created a temporary user:

cd /etc/squid/
sudo htpasswd -B squid-password temp
sudo service squid reload

tried the following command

curl -v -x https://developernote.com:3129 --proxy-user temp:<password> -I https://api.ipify.org/

with another internet provider and it succeeded.

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Reducing image size with command line

With the command below

mogrify -path . -strip -quality 50% *.jpg

I reduces the size of the following images

-rwxrwxrwx 1 def def 4.0M Apr  9 16:48 20250409_164822.jpg*
-rwxrwxrwx 1 def def 3.6M Apr  9 16:48 20250409_164831.jpg*
-rwxrwxrwx 1 def def 4.2M Apr  9 16:49 20250409_164902.jpg*
-rwxrwxrwx 1 def def 4.1M Apr  9 16:49 20250409_164910.jpg*
-rwxrwxrwx 1 def def 3.7M Apr  9 16:49 20250409_164917.jpg*
-rwxrwxrwx 1 def def 3.8M Apr  9 16:49 20250409_164924.jpg*
(more…)

Subscribing to all ByBit trade streams in Python

from pybit.unified_trading import WebSocket
from pybit.unified_trading import HTTP
from time import sleep

session = HTTP(testnet=False)

info = session.get_instruments_info(category="spot")

symbol_infos = info["result"]["list"]

websockets = []

def handle_message(message):
    print(message)

def subscribe(websockets, symbols):
    print(f'Subscribing to {symbols}')
    ws = WebSocket(
        testnet=False,
        channel_type="spot",
    )
    ws.trade_stream(symbol=symbols, callback=handle_message)
    websockets += [ws]
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Subscribing to ByBit WebSocket streams in Python

Spot is limited to 10 symbols:

from pybit.unified_trading import WebSocket
from time import sleep

ws = WebSocket(
    testnet=True,
    channel_type="spot",
)

def handle_message(message):
    print(message)

#ws.orderbook_stream(50, "BTCUSDT", handle_message)
ws.ticker_stream(symbol=["BTCUSDT", "ETHUSDT"], callback=handle_message)

while True:
    sleep(1)
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