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Going over 300℃ with a all metal hotend on Ender 3 v2
Marlin 2.0 guide to Ender 3 v2 upgrades including all metal hotend, BL Touch, and filament runout sensor
Making a filament runout for Ender 3 v2 from a Z-stop + Marlin 2.0 guide
While you could wake up your PC from a mobile directly, having a dedicated server capable of doing so is the best solution. The reason is simple. You can hook up as many devices as you wish with a single endpoint. This is why Raspberry Pi is perfect for this.
Thankfully, adding BT Touch to Ender 3 v2 is so much easier - here are all steps to consider
How to flash Tasmota on ESP devices with new Tasmotizer tool