pinetime-zephyr

Current Time Service

https://www.bluetooth.com/specifications/gatt/services/

https://www.bluetooth.com/specifications/gatt/characteristics/

Requirements:

You need :

* a CTS server (use of bluez on linux explained, and android!)


        * start the CTS service (python script: gatt-cts-server.py provided)


        * connect to the CTS client


* a CTS client (the oswatch)

BLE Peripheral CTS sample for zephyr

This example demonstrates the basic usage of the current time service. It is based on the https://github.com/Dejvino/pinetime-hermes-firmware.

It starts advertising it’s UUID, and you can connect to it. Once connected, it will read the time from your CTS server (bluez on linux running the gatt-cts-server script in my case)

first build the image

$  west build -p -b pinetime_devkit1 oswatch-cts

Using bluez on linux to connect

The pinetime zephyr sample behaves as a peripheral:

- make sure your linuxbox has bluez running (type bluetoothctl if you're not sure)
- first of all start the cts service : python gatt-cts-server.py
- connect to the pinetime with bluetoothctl

Using bluetoothctl:

#bluetoothctl
[bluetooth]#scan on


[NEW] Device 60:7C:9E:92:50:C1 Zephyr Peripheral Sample Long
once you see your device
[blueooth]#connect 60:7C:9E:92:50:C1 (the device mac address as displayed)

Howto use Bluez on linux to set up a time service

Within the bluez source distribution there is an example GATT (Generic Attribute Profile)server. It advertises some standard service such as heart rate, battery … Koen zandberg adapted this script, so it advertises the current time : https://github.com/bosmoment/gatt-cts/blob/master/gatt-cts-server.py

You might have to install extra packages:

apt-get install python-dbus
apt-get install python-gi
apt-get install python-gobject

Howto use Android to set up a time service

As soon as a device is bonded, Pinetime will look for a CTS server (Current Time Service) on the connected device. Here is how to do it with an Android smartphone running NRFConnect:

Start NRFConnect and create a CTS server : Tap the hamburger button on the top left and select “Configure GATT server”.

Tap “Add service” on the bottom Select server configuration “Current Time Service” (0x1805)

Here is for a manual time setup : add the Current Time 0x2A2B characteristic : in the intial value field add 0x141505130B0D which corresponds to (2021 year 05 month 19 day 11hours 13 minutes)

A device called “PineTime” or “DSD6”, or whichever name you gave it, should appear.

Tap the button “Connect” next to the PineTime device.

Disconnect and the newly set time should appear.

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