<![CDATA[Having trouble with Bluetooth LE on Cardputer]]>I'm developing my software, but noticed one issue I couldn't get rid of. I'm developing in Arduino IDE and using BLE libraries provided by M5Stack package. Even the simplest examples also have this issue.
Program comes down to this:

  1. Initialise and start BLE server with onConnect() and onDisconnect() callbacks.
  2. Start advertising BLE device.

Expected behaviour is: I launch Cardputer, it advertises itself as BLE device, I connect to it.
Actual behaviour: I launch Cardputer, BLE server automatically fires onConnect(), then onDisconnect() (it does it constantly if I advertise when disconnected). But I still can connect to it.

I can even get mac address of a supposedly connected device. But my Bluetooth scanner doesn't show this mac, also this mac isn't from Cardputer.

I tried changing a lot of parameters, but discovered that not advertising (removing BLEDevice::startAdvertising();) removes this issue. But that means I can't connect to it now.

I tried loading the same program on M5StickC Plus2 and it actually works as expected. onConnect() and onDisconnect() don't fire automatically.

How do I solve this issue? My Cardputer is basically new.

]]>https://community.m5stack.com/topic/7169/having-trouble-with-bluetooth-le-on-cardputerRSS for NodeSun, 15 Mar 2026 02:48:37 GMTTue, 07 Jan 2025 11:15:26 GMT60<![CDATA[Reply to Having trouble with Bluetooth LE on Cardputer on Fri, 19 Dec 2025 15:00:48 GMT]]>Hi! Have you been able to solve the problem? If so, please tell me how. I am using the ESP32_BLE_KEYBOARD library, and when I connect my PC/phone via Bluetooth (BLE) to my Cardputer on STAMPS3A, it causes the Cardputer to reboot

]]>https://community.m5stack.com/post/30329https://community.m5stack.com/post/30329Fri, 19 Dec 2025 15:00:48 GMT