ELEC-C7222 Library Examples: Custom Service READ + WRITE Example

This example demonstrates the minimal pattern for implementing a custom BLE service with a readable characteristic and a writable characteristic.

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Target

• example-ble-custom-service-rw

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Files

• libs/elec_c7222/examples/ble/custom-service-rw/main_ble_custom_service_rw.cpp
• libs/elec_c7222/examples/ble/custom-service-rw/app_profile.gatt

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What it demonstrates

• Defining a custom service in a .gatt file
• Finding services/characteristics by UUID using AttributeServer
• Handling writes using Characteristic::EventHandler
• Updating a readable characteristic in response to a write

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GATT layout

Custom vendor service: 0xFFE0

UUID	Name	Properties
0xFFE1	PublicValue	READ
0xFFE2	WriteValue	WRITE / WRITE_WITHOUT_RESPONSE

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How to test (nRF Connect / LightBlue)

1. Connect to the device (c7222-rw-demo)
2. Read PublicValue -> returns the current value
3. Write any bytes to WriteValue
4. Read PublicValue again -> it becomes whatever you wrote

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Notes

The .gatt file uses DYNAMIC for both characteristics so the application can update values and receive write events.