Can't get nrfConnect to recognize a custom uuid

RE: Can't get nrfConnect to recognize a custom uuid

Amanda Hsieh — Fri, 24 Oct 2025 17:11:27 GMT

Check out this post. You can play and test with Nordic UART Service.

RE: Can't get nrfConnect to recognize a custom uuid

kruenheck — Mon, 20 Oct 2025 20:04:23 GMT

I added characteristics and I still only see numbers on nrfConnect

"uuid16bitDescriptorDefinitions": {},
"uuid128bitServiceDefinitions":
{
"6E400001-B5A3-F393-E0A9-E50E24DCCA9E":
{
"name": "UART over BLE"
}
"00002323-1212-efde-2323-785feabcd123":
{
"name": "My New service"
}
},
"uuid128bitCharacteristicDefinitions":
{
"6E400002B5A3F393E0A9E50E24DCCA9E":
{
"name": "UART RX"
},
"6E400003B5A3F393E0A9E50E24DCCA9E":
{
"name": "UART TX"
}
"000023241212efde2323785feabcd123":
{
"name": "Blah1"
},
"000023251212efde2323785feabcd123":
{
"name": "Blah2"
},
"000023261212efde2323785feabcd123":
{
"name": "Blah3"
},
"000023271212efde2323785feabcd123":
{
"name": "Blah4"
},

},
"uuid128bitDescriptorDefinitions": {}
}

RE: Can't get nrfConnect to recognize a custom uuid

Amanda Hsieh — Mon, 20 Oct 2025 18:13:21 GMT

There is no uuid128bitCharacteristicDefinitions and name for your custom UUID.

RE: Can't get nrfConnect to recognize a custom uuid

kruenheck — Fri, 17 Oct 2025 21:35:48 GMT

How is this different from what I'm doing?

RE: Can't get nrfConnect to recognize a custom uuid

Amanda Hsieh — Fri, 17 Oct 2025 20:09:56 GMT

Hi,

Please refer to the example to update for your custom UUID.

{
    "_comment": {
        "comment": [
            "Add UUIDs for your services, characteristics, and descriptors in this file.",
            "The format is the UUID of the item, followed by an object containing the data.",
            "'name' is a mandatory handle, while 'format' is optional.",
            "Currently the only supported format is 'TEXT', default is 'NO_FORMAT'.",
            "The application must be reloaded to access changes in this file."
        ]
    },
    "uuid16bitServiceDefinitions": {
        "180D": {
            "name": "Heart Rate"
        }
    },
    "uuid16bitCharacteristicDefinitions": {
        "2A37": {
            "name": "Heart Rate Measurement"
        },
        "2A29": {
            "name": "Manufacturer Name String",
            "format": "TEXT"
        }
    },
    "uuid16bitDescriptorDefinitions": {},
    "uuid128bitServiceDefinitions": {
        "6E400001B5A3F393E0A9E50E24DCCA9E": {
            "name": "UART over BLE"
        }
    },
    "uuid128bitCharacteristicDefinitions": {
        "6E400002B5A3F393E0A9E50E24DCCA9E": {
            "name": "UART RX"
        },
        "6E400003B5A3F393E0A9E50E24DCCA9E": {
            "name": "UART TX"
        }
    },
    "uuid128bitDescriptorDefinitions": {}
}

Regards,
Amanda H.