Why can I discover a BLE beacon but not connect to it?

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Read this official Leafony page and explain its key points in English. For hardware help, first ask for a photo or the installed leaf models, assembly and power sources, then the goal and tools. Clarify which LED or display changed and whether a cable or leaf was replaced. Do not equate an unseen reset button with an absent one, or I2C acknowledgement with a working display. Verify specifications against sources; distinguish observations from hypotheses. Follow a redirect to its destination; if unreadable, ask for the relevant text instead of guessing.

Page: Why can I discover a BLE beacon but not connect to it?

URL: https://docs.leafony.com/en/questions/ble-beacon-connection/

Description / headings (excerpt): STM32 Simple BLE Beacon is configured for reading Advertising data without a connection. It serves a different purpose from a connected receiver sample.

If you are running STM32 Simple BLE Beacon, operating without a connection is intentional. Discovering a device does not necessarily mean it accepts connections.

This sample uses LE_GAP_SCANNABLE_NON_CONNECTABLE. The receiver reads Advertising data by scanning; the published code sends the device name Leaf_A and the text HELLO BEACON.

To receive sensor values after connecting or send commands to Leafony, start with a connection-based sample such as STM32 Web Bluetooth.

Other beacon samples and custom programs may use different connection settings and data formats. First check the name of the program running on the device.