mirror of
https://github.com/h2zero/esp-nimble-cpp.git
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302 lines
8.1 KiB
C++
302 lines
8.1 KiB
C++
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/*
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* NimBLEUUID.cpp
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*
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* Created: on Jan 24 2020
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* Author H2zero
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*
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* Originally:
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*
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* BLEUUID.cpp
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*
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* Created on: Jun 21, 2017
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* Author: kolban
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*/
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#include "sdkconfig.h"
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#if defined(CONFIG_BT_ENABLED)
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#include "NimBLEUtils.h"
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#include "NimBLEUUID.h"
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#include "NimBLELog.h"
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static const char* LOG_TAG = "NimBLEUUID";
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/**
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* @brief Create a UUID from a string.
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*
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* Create a UUID from a string. There will be two possible stories here. Either the string represents
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* a binary data field or the string represents a hex encoding of a UUID.
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* For the hex encoding, here is an example:
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*
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* ```
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* "beb5483e-36e1-4688-b7f5-ea07361b26a8"
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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* 12345678-90ab-cdef-1234-567890abcdef
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* ```
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*
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* This has a length of 36 characters. We need to parse this into 16 bytes.
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*
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* @param [in] value The string to build a UUID from.
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*/
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NimBLEUUID::NimBLEUUID(std::string value) {
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m_valueSet = true;
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if (value.length() == 4) {
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m_uuid.u.type = BLE_UUID_TYPE_16;
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m_uuid.u16.value = 0;
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for(int i=0;i<value.length();){
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uint8_t MSB = value.c_str()[i];
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uint8_t LSB = value.c_str()[i+1];
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if(MSB > '9') MSB -= 7;
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if(LSB > '9') LSB -= 7;
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m_uuid.u16.value += (((MSB&0x0F) <<4) | (LSB & 0x0F))<<(2-i)*4;
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i+=2;
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}
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}
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else if (value.length() == 8) {
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m_uuid.u.type = BLE_UUID_TYPE_32;
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m_uuid.u32.value = 0;
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for(int i=0;i<value.length();){
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uint8_t MSB = value.c_str()[i];
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uint8_t LSB = value.c_str()[i+1];
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if(MSB > '9') MSB -= 7;
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if(LSB > '9') LSB -= 7;
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m_uuid.u32.value += (((MSB&0x0F) <<4) | (LSB & 0x0F))<<(6-i)*4;
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i+=2;
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}
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}
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else if (value.length() == 16) { // how we can have 16 byte length string reprezenting 128 bit uuid??? needs to be investigated (lack of time)
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m_uuid.u.type = BLE_UUID_TYPE_128;
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NimBLEUtils::memrcpy(m_uuid.u128.value, (uint8_t*)value.data(), 16);
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}
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else if (value.length() == 36) {
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// If the length of the string is 36 bytes then we will assume it is a long hex string in
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// UUID format.
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m_uuid.u.type = BLE_UUID_TYPE_128;
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int n = 0;
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for(int i=0;i<value.length();){
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if(value.c_str()[i] == '-')
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i++;
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uint8_t MSB = value.c_str()[i];
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uint8_t LSB = value.c_str()[i+1];
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if(MSB > '9') MSB -= 7;
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if(LSB > '9') LSB -= 7;
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m_uuid.u128.value[15-n++] = ((MSB&0x0F) <<4) | (LSB & 0x0F);
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i+=2;
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}
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}
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else {
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NIMBLE_LOGE(LOG_TAG,"ERROR: UUID value not 2, 4, 16 or 36 bytes");
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m_valueSet = false;
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}
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} // NimBLEUUID(std::string)
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/**
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* @brief Create a UUID from 16 bytes of memory.
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*
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* @param [in] pData The pointer to the start of the UUID.
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* @param [in] size The size of the data.
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* @param [in] msbFirst Is the MSB first in pData memory?
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*/
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NimBLEUUID::NimBLEUUID(uint8_t* pData, size_t size, bool msbFirst) {
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/*** TODO: change this to use the Nimble function for various lenght UUIDs:
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int ble_uuid_init_from_buf(ble_uuid_any_t *uuid, const void *buf, size_t len);
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***/
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if (size != 16) {
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NIMBLE_LOGE(LOG_TAG,"ERROR: UUID length not 16 bytes");
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return;
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}
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m_uuid.u.type = BLE_UUID_TYPE_128;
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if (msbFirst) {
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NimBLEUtils::memrcpy(m_uuid.u128.value, pData, 16);
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} else {
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memcpy(m_uuid.u128.value, pData, 16);
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}
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m_valueSet = true;
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} // NimBLEUUID
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/**
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* @brief Create a UUID from the 16bit value.
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*
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* @param [in] uuid The 16bit short form UUID.
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*/
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NimBLEUUID::NimBLEUUID(uint16_t uuid) {
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m_uuid.u.type = BLE_UUID_TYPE_16;
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m_uuid.u16.value = uuid;
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m_valueSet = true;
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} // NimBLEUUID
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/**
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* @brief Create a UUID from the 32bit value.
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*
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* @param [in] uuid The 32bit short form UUID.
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*/
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NimBLEUUID::NimBLEUUID(uint32_t uuid) {
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m_uuid.u.type = BLE_UUID_TYPE_32;
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m_uuid.u32.value = uuid;
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m_valueSet = true;
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} // NimBLEUUID
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/**
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* @brief Create a UUID from the native UUID.
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*
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* @param [in] uuid The native UUID.
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*/
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NimBLEUUID::NimBLEUUID(ble_uuid128_t* uuid) {
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m_uuid.u.type = BLE_UUID_TYPE_128;
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memcpy(m_uuid.u128.value, uuid->value, 16);
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m_valueSet = true;
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} // NimBLEUUID
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NimBLEUUID::NimBLEUUID() {
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m_valueSet = false;
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} // NimBLEUUID
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/**
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* @brief Get the number of bits in this uuid.
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* @return The number of bits in the UUID. One of 16, 32 or 128.
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*/
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uint8_t NimBLEUUID::bitSize() {
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if (!m_valueSet) return 0;
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return m_uuid.u.type;
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} // bitSize
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/**
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* @brief Compare a UUID against this UUID.
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*
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* @param [in] uuid The UUID to compare against.
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* @return True if the UUIDs are equal and false otherwise.
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*/
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bool NimBLEUUID::equals(NimBLEUUID uuid) {
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if(ble_uuid_cmp(&m_uuid.u, &uuid.getNative()->u) == 0){
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return true;
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}
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return false;
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}
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/**
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* Create a BLEUUID from a string of the form:
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* 0xNNNN
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* 0xNNNNNNNN
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* 0x<UUID>
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* NNNN
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* NNNNNNNN
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* <UUID>
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*/
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NimBLEUUID NimBLEUUID::fromString(std::string _uuid) {
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uint8_t start = 0;
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if (strstr(_uuid.c_str(), "0x") != nullptr) { // If the string starts with 0x, skip those characters.
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start = 2;
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}
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uint8_t len = _uuid.length() - start; // Calculate the length of the string we are going to use.
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if(len == 4) {
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uint16_t x = strtoul(_uuid.substr(start, len).c_str(), NULL, 16);
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return NimBLEUUID(x);
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} else if (len == 8) {
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uint32_t x = strtoul(_uuid.substr(start, len).c_str(), NULL, 16);
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return NimBLEUUID(x);
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} else if (len == 36) {
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return NimBLEUUID(_uuid);
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}
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return NimBLEUUID();
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} // fromString
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/**
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* @brief Get the native UUID value.
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*
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* @return The native UUID value or NULL if not set.
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*/
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ble_uuid_any_t* NimBLEUUID::getNative() {
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if (m_valueSet == false) {
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NIMBLE_LOGD(LOG_TAG,"<< Return of un-initialized UUID!");
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return nullptr;
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}
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return &m_uuid;
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} // getNative
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/**
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* @brief Convert a UUID to its 128 bit representation.
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*
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* A UUID can be internally represented as 16bit, 32bit or the full 128bit. This method
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* will convert 16 or 32 bit representations to the full 128bit.
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*/
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NimBLEUUID NimBLEUUID::to128() {
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// If we either don't have a value or are already a 128 bit UUID, nothing further to do.
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if (!m_valueSet || m_uuid.u.type == BLE_UUID_TYPE_128) {
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return *this;
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}
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// If we are 16 bit or 32 bit, then set the 4 bytes of the variable part of the UUID.
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if (m_uuid.u.type == BLE_UUID_TYPE_16) {
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uint16_t temp = m_uuid.u16.value;
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m_uuid.u128.value[15] = 0;
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m_uuid.u128.value[14] = 0;
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m_uuid.u128.value[13] = (temp >> 8) & 0xff;
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m_uuid.u128.value[12] = temp & 0xff;
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}
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else if (m_uuid.u.type == BLE_UUID_TYPE_32) {
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uint32_t temp = m_uuid.u32.value;
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m_uuid.u128.value[15] = (temp >> 24) & 0xff;
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m_uuid.u128.value[14] = (temp >> 16) & 0xff;
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m_uuid.u128.value[13] = (temp >> 8) & 0xff;
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m_uuid.u128.value[12] = temp & 0xff;
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}
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// Set the fixed parts of the UUID.
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m_uuid.u128.value[11] = 0x00;
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m_uuid.u128.value[10] = 0x00;
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m_uuid.u128.value[9] = 0x10;
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m_uuid.u128.value[8] = 0x00;
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m_uuid.u128.value[7] = 0x80;
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m_uuid.u128.value[6] = 0x00;
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m_uuid.u128.value[5] = 0x00;
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m_uuid.u128.value[4] = 0x80;
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m_uuid.u128.value[3] = 0x5f;
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m_uuid.u128.value[2] = 0x9b;
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m_uuid.u128.value[1] = 0x34;
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m_uuid.u128.value[0] = 0xfb;
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m_uuid.u.type = BLE_UUID_TYPE_128;
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return *this;
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} // to128
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/**
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* @brief Get a string representation of the UUID.
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*
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* The format of a string is:
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* 01234567 8901 2345 6789 012345678901
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* 0000180d-0000-1000-8000-00805f9b34fb
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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*
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* @return A string representation of the UUID.
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*/
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std::string NimBLEUUID::toString() {
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if (!m_valueSet) return "<NULL>"; // If we have no value, nothing to format.
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char buf[BLE_UUID_STR_LEN];
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return ble_uuid_to_str(&m_uuid.u, buf);
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} // toString
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#endif /* CONFIG_BT_ENABLED */
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