В следующем примере BLE: я хотел бы разделить число с плавающей запятой на элементы, которые я мог бы назначить в CUSTOM_UUID.
Например: взять 12345.67 и каким-то образом назначить его в CUSTOM_UUID [] как
const uint8_t CUSTOM_UUID[] =
{
0X00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x01, 0x32, 0x54, 0x67
};
BLEUuid uuid = BLEUuid(CUSTOM_UUID);
Текущий формат отображается в объявлении BLE как: 00000000-0000-0000-0000-000000000000, поэтому я хотел бы получить что-то вроде: 00000000-0000-0000-0000-000001234567 в качестве первого шага.,Следующий шаг будет иметь дело с десятичной дробью.
/*********************************************************************
This is an example for our nRF52 based Bluefruit LE modules
Pick one up today in the adafruit shop!
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MIT license, check LICENSE for more information
All text above, and the splash screen below must be included in
any redistribution
Author: KTOWN (Kevin Townsend)
Copyright (C) Adafruit Industries 2017
*********************************************************************/
/* This example constantly advertises a custom 128-bit UUID, and is
* intended to be used in combination with a Central sketch that scans
* for this UUID, and then displays an alert message, sorting matching
* devices by their RSSI level which is an approximate indication of
* distance (although highly subject to environmental obstacles).
*
* By including a custom UUID in the advertising packet, we can easily
* filter the scan results on the Central device, rather than manually
* parsing the advertising packet(s) of every device in range.
*
* This example is intended to be run with the *_central.ino version
* of this application.
*/
#include <bluefruit.h>
#include <ble_gap.h>
//int test_hex = 0x55;
// Software Timer for blinking RED LED
SoftwareTimer blinkTimer;
// Custom UUID used to differentiate this device.
// Use any online UUID generator to generate a valid UUID.
// Note that the byte order is reversed ... CUSTOM_UUID
// below corresponds to the follow value:
// df67ff1a-718f-11e7-8cf7-a6006ad3dba0
const uint8_t CUSTOM_UUID[] =
{
0X00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
BLEUuid uuid = BLEUuid(CUSTOM_UUID);
void setup()
{
Serial.begin(115200);
while ( !Serial ) delay(10); // for nrf52840 with native usb
Serial.println("Bluefruit52 Peripheral Proximity Example");
Serial.println("----------------------------------------\n");
// Initialize blinkTimer for 1000 ms and start it
blinkTimer.begin(1000, blink_timer_callback);
blinkTimer.start();
err_t err = Bluefruit.begin();
if (err)
{
Serial.print("Unable to init Bluefruit (ERROR CODE: ");
Serial.print(err);
Serial.println(")");
while(1)
{
digitalToggle(LED_RED);
delay(100);
}
}
else
{
Serial.println("Bluefruit initialized (peripheral mode)");
}
// Set max power. Accepted values are: -40, -30, -20, -16, -12, -8, -4, 0, 4
Bluefruit.setTxPower(4);
Bluefruit.setName("Bluefruit52");
// Set up and start advertising
startAdv();
Serial.println("Advertising started");
}
void startAdv(void)
{
// Note: The entire advertising packet is limited to 31 bytes!
// Advertising packet
Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
Bluefruit.Advertising.addTxPower();
// Preferred Solution: Add a custom UUID to the advertising payload, which
// we will look for on the Central side via Bluefruit.Scanner.filterUuid(uuid);
// A valid 128-bit UUID can be generated online with almost no chance of conflict
// with another device or etup
Bluefruit.Advertising.addUuid(uuid);
// Alternative Solution: Manufacturer Specific Data (MSD)
// You could also send a custom MSD payload and filter for the 'Company ID'
// via 'Bluefruit.Scanner.filterMSD(CID);', although this does require a
// valid CID, which is why the UUID method above is more appropriate in
// most situations. For a complete list of valid company IDs see:
// https://www.bluetooth.com/specifications/assigned-numbers/company-identifiers
// For test purposes, 0xFFFF CAN be used, but according to the Bluetooth SIG:
// > "This value may be used in the internal and interoperability tests before a
// > Company ID has been assigned. This value shall not be used in shipping end
// > products."
uint8_t msd_payload[4]; // Two bytes are required for the CID, so we have 2 bytes user data, expand as needed
uint16_t msd_cid = 0xFFFF;
memset(msd_payload, 0, sizeof(msd_payload));
memcpy(msd_payload, (uint8_t*)&msd_cid, sizeof(msd_cid));
msd_payload[2] = 0x11;
msd_payload[3] = 0x22;
Bluefruit.Advertising.addData(BLE_GAP_AD_TYPE_MANUFACTURER_SPECIFIC_DATA, msd_payload, sizeof(msd_payload));
// Not enough room in the advertising packet for name
// so store it in the Scan Response instead
Bluefruit.ScanResponse.addName();
/* Start Advertising
* - Enable auto advertising if disconnected
* - Interval: fast mode = 20 ms, slow mode = 152.5 ms
* - Timeout for fast mode is 30 seconds
* - Start(timeout) with timeout = 0 will advertise forever (until connected)
*
* For recommended advertising interval
* https://developer.apple.com/library/content/qa/qa1931/_index.html
*/
Bluefruit.Advertising.restartOnDisconnect(true);
Bluefruit.Advertising.setInterval(32, 244); // in units of 0.625 ms
Bluefruit.Advertising.setFastTimeout(30); // number of seconds in fast mode
Bluefruit.Advertising.start();
}
void loop()
{
}
/**
* Software Timer callback is invoked via a built-in FreeRTOS thread with
* minimal stack size. Therefore it should be as simple as possible. If
* a periodically heavy task is needed, please use Scheduler.startLoop() to
* create a dedicated task for it.
*
* More information http://www.freertos.org/RTOS-software-timer.html
*/
void blink_timer_callback(TimerHandle_t xTimerID)
{
(void) xTimerID;
digitalToggle(LED_RED);
}