Add doc about BLE in README.md
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README.md
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README.md
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@ -26,7 +26,7 @@ I've tested this project on the actual PineTime hardware.
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* Logs available via JLink RTT;
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* Basic LCD driver.
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## How to use it
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## How to build
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* Download and unzip arm-none-eabi and NRF52 SDK
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* Clone this repo
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@ -68,3 +68,20 @@ $ JLinkRTTClient
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## Tools
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- https://github.com/eliotstock/memory : display the memory usage (FLASH/RAM) using the .map file from GCC.
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## BLE connection, bonding and time synchronization
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At runtime, BLE advertising is started. You can then use a smartphone or computer to connect and bond to your Pinetime.
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As soon as a device is bonded, Pinetime will look for a **CTS** server (**C**urrent **T**ime **S**ervice) on the connected device.
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Here is how to do it with an Android smartphone running NRFConnect:
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* Build and program the firmware on the Pinetime
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* Install NRFConnect (https://www.nordicsemi.com/Software-and-Tools/Development-Tools/nRF-Connect-for-desktop)
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* Start NRFConnect and create a CTS server :
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- Tap the hamburger button on the top left and select "Configure GATT server"
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- Tap "Add service" on the bottom
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- Select server configuration "Current Time Service" and tap OK
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* Go back to the main screen and scan for BLE devices. A device called "PineTime" should appear
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* Tap the button "Connect" next to the PineTime device. It should connect to the PineTime and switch to a new tab.
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* On this tab, on the top right, there is a 3 dots button. Tap on it and select Bond. The bonding process begins, and if it is sucessful, the PineTime should update its time and display it on the screen.
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