feat(NimBLEAdvertising): support std::function for advertising complete callback (#157)

Updates the interface to use a typedef'd std::function for the advertise callback, which is backwards compatible but also allows std::bind and lambda functions.

Author: finger563

src/NimBLEAdvertising.cpp

@@ -400,7 +400,7 @@ void NimBLEAdvertising::setScanResponseData(NimBLEAdvertisementData& advertiseme
  * @param [in] dirAddr The address of a peer to directly advertise to.
  * @return True if advertising started successfully.
  */
-bool NimBLEAdvertising::start(uint32_t duration, void (*advCompleteCB)(NimBLEAdvertising *pAdv), NimBLEAddress* dirAddr) {
+bool NimBLEAdvertising::start(uint32_t duration, advCompleteCB_t advCompleteCB, NimBLEAddress* dirAddr) {
     NIMBLE_LOGD(LOG_TAG, ">> Advertising start: customAdvData: %d, customScanResponseData: %d",
                 m_customAdvData, m_customScanResponseData);
 

src/NimBLEAdvertising.h

@@ -33,6 +33,7 @@
 #include "NimBLEUUID.h"
 #include "NimBLEAddress.h"
 
+#include <functional>
 #include <vector>
 
 /* COMPATIBILITY - DO NOT USE */
@@ -44,6 +45,9 @@
 #define ESP_BLE_ADV_FLAG_NON_LIMIT_DISC     (0x00 )
  /* ************************* */
 
+class NimBLEAdvertising;
+
+typedef std::function<void(NimBLEAdvertising*)> advCompleteCB_t;
 
 /**
  * @brief Advertisement data set by the programmer to be published by the %BLE server.
@@ -93,7 +97,7 @@ class NimBLEAdvertising {
     void addServiceUUID(const NimBLEUUID &serviceUUID);
     void addServiceUUID(const char* serviceUUID);
     void removeServiceUUID(const NimBLEUUID &serviceUUID);
-    bool start(uint32_t duration = 0, void (*advCompleteCB)(NimBLEAdvertising *pAdv) = nullptr, NimBLEAddress* dirAddr = nullptr);
+    bool start(uint32_t duration = 0, advCompleteCB_t advCompleteCB = nullptr, NimBLEAddress* dirAddr = nullptr);
     bool stop();
     void setAppearance(uint16_t appearance);
     void setName(const std::string &name);
@@ -130,7 +134,7 @@ class NimBLEAdvertising {
     bool                    m_customScanResponseData;
     bool                    m_scanResp;
     bool                    m_advDataSet;
-    void                    (*m_advCompCB)(NimBLEAdvertising *pAdv);
+    advCompleteCB_t         m_advCompCB{nullptr};
     uint8_t                 m_slaveItvl[4];
     uint32_t                m_duration;
     std::vector<uint8_t>    m_svcData16;