[BLE] Allows you to specify which channels are used to advertise. (espressif#4954)

In some use cases getting rssi signal from one channel is more stable (less variance) than rssi from the three advertising channels. This change allows you to specify which channels are used to advertise.

Author: raulcigil

libraries/BLE/src/BLEAdvertising.cpp

@@ -91,6 +91,10 @@ void BLEAdvertising::setAdvertisementType(esp_ble_adv_type_t adv_type){
  m_advParams.adv_type = adv_type;
 } // setAdvertisementType
 
+voidBLEAdvertising::setAdvertisementChannelMap(esp_ble_adv_channel_t channel_map){
+ m_advParams.channel_map = channel_map;
+} // setAdvertisementChannelMap
+
 voidBLEAdvertising::setMinInterval(uint16_t mininterval){
  m_advParams.adv_int_min = mininterval;
 } // setMinInterval

libraries/BLE/src/BLEAdvertising.h

@@ -53,6 +53,7 @@ class BLEAdvertising{
 voidstop();
 voidsetAppearance(uint16_t appearance);
 voidsetAdvertisementType(esp_ble_adv_type_t adv_type);
+voidsetAdvertisementChannelMap(esp_ble_adv_channel_t channel_map);
 voidsetMaxInterval(uint16_t maxinterval);
 voidsetMinInterval(uint16_t mininterval);
 voidsetAdvertisementData(BLEAdvertisementData& advertisementData);