Implement functions to retrieve multiple connected devices

[polldo]

These functions can be used to loop the connected devices, centrals or peripherals, through an index that can go from 0 to the maximum number of connected devices allowed. Example:

for (int periphIdx = 0; periphIdx < BLE.peripheralCount(); periphIdx++) {
    BLEDevice peripheral = BLE.peripheral(periphIdx);
    if (peripheral) {
    BLECharacteristic batteryLevelChar = peripheral.characteristic("2A19");
        if (!batteryLevelChar) {
            Serial.println("Peripheral does not have battery level characteristic!");
            peripheral.disconnect();
        }
    }
}

[CLAassistant]

All committers have signed the CLA.

[phyxl]

I need this functionality for my project. Has this library lost support?