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I was able to connect my Raspberry Pi3 to an ESP32 board by Bluetooth LE, but suddenly since yesterday I can’t do it anymore. I can’t even see the device on the bluetooth list. What could the problem be?

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put on hold as too broad by goldilocks 6 hours ago

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.

  • Welcome — but “the problem” could the ESP is broken, the Pi is broken, there is a a weird source of interference, etc. This is not a discussion style site, however, and we require questions with enough objective information to provide a singular meaningful and objective answer. – goldilocks 6 hours ago
  • @yuki182, I have 4 Rpi4B’s and a couple of Esp32 modules on hand. Perhaps I can reproduce your situation and see what is going on. Tell me more about your config/setup so I can catch up. PS – I have about 50+ hobbyist hours of ESP8266-01/12 experience, and 10+ hours of Rpi3 BluZ 5.5 testing experience. – tlfong01 11 mins ago    
  • Let me show you my esp32 list – imgur.com/gallery/avZAWt4. You pick one and I can start setting up. If you have no preference, I would start with D1 Lolin V1. I have tested 5+ types of Esp8266-12 and found WeMos the most newbie friendly. The other reason is that I found less teething problems with NodeMCU LUA and microPython. – tlfong01 3 mins ago    Edit   

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