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‎README.md

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# microbit-beacon-finder
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The micro:bit finds various of BLE Beacons, and display the ID to LEDs.
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## Supported Beacons
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* iBeacon
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* AltBeacon
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* Eddystone-UID
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* Eddystone-URL
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## How to Build
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This project uses yotta to build, not pxt.
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This project uses the another SoftDevice(S130). That enables BLE Central feature.
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Follow these steps to build the project.
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** Don't forget copying NRF51822_S130.ld to NRF51822.ld ! **
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```bash
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# set target to use S130 SoftDevice.
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yt target bbc-microbit-classic-gcc-s130
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# the linker uses `NRF51822.ld` file, then copy `NRF51822_S130.ld` to `NRF51822.ld`.
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cp yotta_targets/bbc-microbit-classic-gcc-s130/ld/NRF51822_S130.ld yotta_targets/bbc-microbit-classic-gcc-s130/ld/NRF51822.ld
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# build the project
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yt build
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# transfer the hex file to micro:bit. (for example, macOS X)
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cp build/bbc-microbit-classic-gcc-s130/source/microbit-ble-bridge-combined.hex /Volumes/MICROBIT/microbit-ble-bridge-combined.hex
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```

‎config.json

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{
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"microbit": {
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"S130": true,
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"configfile": "source/MicroBitCustomConfig.h"
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}
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}

‎module.json

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{
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"name": "microbit-ble-bridge",
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"version": "0.0.2-dev01",
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"description": "A BLE to USB Serial bridge for the micro:bit, using a micro:bit",
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"licenses": [
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{
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"url": "https://spdx.org/licenses/Apache-2.0",
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"type": "Apache-2.0"
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}
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],
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"dependencies": {
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"mbed-classic": "lancaster-university/mbed-classic#microbit_hfclk+mb6",
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"ble": "lancaster-university/BLE_API#v2.5.0+mb3",
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"ble-nrf51822": "lancaster-university/nrf51822#v2.5.0+mb7",
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"nrf51-sdk": "lancaster-university/nrf51-sdk#v2.2.0+mb4",
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"microbit-dal": "lancaster-university/microbit-dal#v2.0.0-rc10",
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"microbit": "lancaster-university/microbit"
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},
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"targetDependencies": {},
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"bin": "./source"
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}
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‎source/MicroBitCustomConfig.h

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/**
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* Custom Compile time configuration options for the micro:bit runtime.
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*/
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#ifndef MICROBIT_CUSTOM_CONFIG_H
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#define MICROBIT_CUSTOM_CONFIG_H
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//
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// We don't want to use any of the micro:bit BLE services, so we disable them
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#define MICROBIT_BLE_ENABLED 0
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#define MICROBIT_BLE_BLUEZONE 0 // We don't need this either
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// But we are going to bring up the S130 soft-device. The DAL assumes that
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// if MICROBIT_BLE_ENABLED is not set then the memory from the softdevice
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// can be re-used as extra heap, but we don't want this, so we set the memory
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// limits explicity
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// The lowest address of memory that is safe to use as heap storage when BLE is ENABLED
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// Used to define the base of the heap when MICROBIT_HEAP_REUSE_SD is defined.
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#define MICROBIT_HEAP_BASE_BLE_ENABLED 0x20002500 // S130 build value
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#define MICROBIT_HEAP_BASE_BLE_DISABLED MICROBIT_HEAP_BASE_BLE_ENABLED // Force the MicrobitHeapAllocator not to use all the S130 memory
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#endif

‎source/main.cpp

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#include "MicroBitCustomConfig.h"
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#include "MicroBit.h"
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#include "ble/DiscoveredCharacteristic.h"
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#include "ble/DiscoveredService.h"
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#if YOTTA_CFG_MICROBIT_S130 != 1
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#error This code *only* works with the Nordic S130 softdevice
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#endif
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#if CONFIG_ENABLED(MICROBIT_DBG)
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#error use of the serial port by MICROBIT_DBG clashes with our use of the serial port - not uspported
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#endif
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MicroBit uBit;
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void advertisementCallback(const Gap::AdvertisementCallbackParams_t *params)
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{
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const uint8_t len = params->advertisingDataLen;
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if (len == 27)
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{
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// check iBeacon header
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if (
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params->advertisingData[0] == 0x1a &&
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params->advertisingData[1] == 0xff &&
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params->advertisingData[2] == 0x4c &&
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params->advertisingData[3] == 0x00 &&
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params->advertisingData[4] == 0x02 &&
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params->advertisingData[5] == 0x15)
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{
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char uuid[33]{};
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uint8_t unib{};
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uint8_t lnib{};
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for (int i = 0; i < 16; ++i)
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{
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unib = params->advertisingData[6 + i] >> 4;
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lnib = params->advertisingData[6 + i] & 0xf;
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if (unib < 10)
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{
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uuid[i * 2] = '0' + unib;
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}
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else
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{
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uuid[i * 2] = 'A' + unib - 10;
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}
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if (lnib < 10)
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{
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uuid[i * 2 + 1] = '0' + lnib;
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}
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else
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{
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uuid[i * 2 + 1] = 'A' + lnib - 10;
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}
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}
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uBit.display.scrollAsync(uuid);
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}
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}
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else if (len == 28)
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{
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// AltBeacon https://github.com/AltBeacon/spec
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// check AltBeacon header
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if (
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params->advertisingData[0] == 0x1b &&
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params->advertisingData[1] == 0xff &&
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params->advertisingData[4] == 0xbe &&
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params->advertisingData[5] == 0xac)
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{
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char beaconId[41]{};
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uint8_t unib{};
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uint8_t lnib{};
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for (int i = 0; i < 20; ++i)
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{
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unib = params->advertisingData[6 + i] >> 4;
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lnib = params->advertisingData[6 + i] & 0xf;
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if (unib < 10)
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{
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beaconId[i * 2] = '0' + unib;
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}
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else
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{
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beaconId[i * 2] = 'A' + unib - 10;
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}
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if (lnib < 10)
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{
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beaconId[i * 2 + 1] = '0' + lnib;
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}
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else
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{
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beaconId[i * 2 + 1] = 'A' + lnib - 10;
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}
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}
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uBit.display.scrollAsync(beaconId);
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}
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}
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else
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{
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if (
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params->advertisingData[0] == 0x03 &&
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params->advertisingData[1] == 0x03 &&
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params->advertisingData[2] == 0xaa &&
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params->advertisingData[3] == 0xfe)
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{
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// Eddystone https://github.com/google/eddystone/blob/master/protocol-specification.md
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if (params->advertisingData[8] == 0x00)
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{
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// Eddystone UID
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// [10bytes]-[6bytes]
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char beaconId[34]{};
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beaconId[20] = '-';
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uint8_t unib{};
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uint8_t lnib{};
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for (int i = 0; i < 10; ++i)
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{
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unib = params->advertisingData[10 + i] >> 4;
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lnib = params->advertisingData[10 + i] & 0xf;
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if (unib < 10)
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{
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beaconId[i * 2] = '0' + unib;
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}
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else
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{
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beaconId[i * 2] = 'A' + unib - 10;
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}
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if (lnib < 10)
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{
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beaconId[i * 2 + 1] = '0' + lnib;
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}
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else
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{
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beaconId[i * 2 + 1] = 'A' + lnib - 10;
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}
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}
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for (int i = 10; i < 16; ++i)
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{
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unib = params->advertisingData[10 + i] >> 4;
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lnib = params->advertisingData[10 + i] & 0xf;
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if (unib < 10)
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{
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beaconId[i * 2 + 1] = '0' + unib;
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}
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else
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{
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beaconId[i * 2 + 1] = 'A' + unib - 10;
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}
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if (lnib < 10)
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{
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beaconId[i * 2 + 2] = '0' + lnib;
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}
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else
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{
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beaconId[i * 2 + 2] = 'A' + lnib - 10;
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}
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}
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uBit.display.scrollAsync(beaconId);
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}
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else if (params->advertisingData[8] == 0x10)
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{
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// Eddystone URL
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uint8_t length = params->advertisingData[4];
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if (length < 6)
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{
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// invalid data
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return;
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}
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ManagedString urlStr("");
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switch (params->advertisingData[10])
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{
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case 0x00:
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urlStr = urlStr + "http://www.";
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break;
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case 0x01:
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urlStr = urlStr + "https://www.";
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break;
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case 0x02:
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urlStr = urlStr + "http://";
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break;
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case 0x03:
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urlStr = urlStr + "https://";
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break;
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}
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for (int i = 0; i < length - 6; ++i)
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{
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uint8_t urlChar = params->advertisingData[11 + i];
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if (urlChar > 0x20 && urlChar < 0x7f)
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{
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urlStr = urlStr + ManagedString((const char)urlChar);
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}
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else
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{
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switch (urlChar)
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{
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case 0x00:
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urlStr = urlStr + ".com/";
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break;
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case 0x01:
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urlStr = urlStr + ".org/";
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break;
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case 0x02:
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urlStr = urlStr + ".edu/";
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break;
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case 0x03:
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urlStr = urlStr + ".net/";
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break;
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case 0x04:
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urlStr = urlStr + ".info/";
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break;
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case 0x05:
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urlStr = urlStr + ".biz/";
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break;
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case 0x06:
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urlStr = urlStr + ".gov/";
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break;
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case 0x07:
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urlStr = urlStr + ".com";
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break;
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case 0x08:
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urlStr = urlStr + ".org";
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break;
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case 0x09:
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urlStr = urlStr + ".edu";
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break;
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case 0x0a:
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urlStr = urlStr + ".net";
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break;
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case 0x0b:
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urlStr = urlStr + ".info";
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break;
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case 0x0c:
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urlStr = urlStr + ".biz";
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break;
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case 0x0d:
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urlStr = urlStr + ".gov";
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break;
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}
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}
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}
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uBit.display.scrollAsync(urlStr);
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}
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}
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else
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{
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#if 0
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// The other data
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char data[len]{};
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uint8_t unib{};
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uint8_t lnib{};
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for (int i = 0; i < len; ++i)
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{
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unib = params->advertisingData[i] >> 4;
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lnib = params->advertisingData[i] & 0xf;
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if (unib < 10)
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{
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data[i * 2] = '0' + unib;
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}
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else
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{
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data[i * 2] = 'A' + unib - 10;
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}
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if (lnib < 10)
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{
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data[i * 2 + 1] = '0' + lnib;
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}
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else
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{
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data[i * 2 + 1] = 'A' + lnib - 10;
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}
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}
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uBit.display.scrollAsync(data);
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#endif
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}
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}
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}
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int main()
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{
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uBit.ble = new BLEDevice();
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uBit.ble->init();
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uBit.ble->gap().setScanParams(500, 400);
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uBit.ble->gap().startScan(advertisementCallback);
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while (true)
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{
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uBit.ble->waitForEvent();
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}
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return 0;
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}

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