How to display Temperature values in a Beacon

RE: How to display Temperature values in a Beacon

norin saiyed — Sat, 03 Mar 2018 06:24:33 GMT

see this link https://devzone.nordicsemi.com/f/nordic-q-a/30913/spi-communication-and-ble-advertising-data-with-nrf52-dk/122550#122550.

you can use your temperature value instead of spi data.

RE: How to display Temperature values in a Beacon

Nguyen Hoan Hoang — Tue, 27 Feb 2018 00:37:21 GMT

There is an example from this blog: Advertising Environmental Sensor Data.

RE: How to display Temperature values in a Beacon

nordicdev — Tue, 27 Feb 2018 00:19:20 GMT

Hi Aleksander,

Thank you for your reply.

I use the ble_app_beacon example and I cannot find any service uuid there (correct me if I am wrong). I found the service uuid to be set in 'service_data_encode' and I had a breakpoint there - but the breakpoint never got fired, which means, the ble_app_beacon does not encode any service uuids. All it has is the APP_BEACON_UUID.

RE: How to display Temperature values in a Beacon

Aleksander Nowakowski — Fri, 23 Feb 2018 15:59:52 GMT

To display as Temperature the service uuid should be: 0x1809 or (afair) 0x2A6E. As pressure: 0x2A6D.

1-byte or 2-byte values are supported, perhaps :) Little endian.

For example, the adv data should contain 05-16-0918-64 to display temp as 100°C. 5 = length, 16 = service data 16-bit uuid, 0918 = 0x1809, 64 = 100 in hex.

RE: How to display Temperature values in a Beacon

Aleksander Nowakowski — Fri, 23 Feb 2018 15:51:49 GMT

Hi,

This is a very good question.

If you're advertising as a beacon (Nordic Beacon, iBeacon, Eddystone or AltBeacon) nRF Connect (before known as nRF Master Control Panel) will parse the data and display accordingly.

nRF Connect sorts also other formats:

If your manufacturer data or service data contain 1, 2, or 4 bytes (except Company Id or Service uuid), till get an option to switch parser to Char, Hex, Uint, Sint, Float 8, 16 or 32 bit.
You may switch those data to Utf-8 string, no matter the length
Some Service uuids have custom parsers. For example, the Temperature char uuid, Hearth Temperature Service uuid, Pressure char uuid. This is the answer for your question.
nRF Connect also parsers some custom known formats, like Anki Drive, Nordic Thingy, Microbit, etc.

Additionally:

If you set the parser to Uint, Sint or Float as in 1. above, or for services from 3., you'll see a graph of those values in adv details (MORE button).
nRF Connect assigns an icon based on various criteria: name, services, company ID, beacon type, etc.

If you, or somebody else, wants to add a different custom parser, or an icon, please contact me. I just need an icon 68x68 and a way to distinguish the device/devices family from others.