Chapter 4. Software framework
4.1.10 What is the transmit power of ESP32 Bluetooth®?
The ESP32 Bluetooth has 8 transmit power levels, corresponding to -12 ~ 9 dBm of transmit power,
with a 3 dBm interval. The controller software limits the transmit power and selects the power level
according to the corresponding power level declared by the product.
4.1.11 Could ESP32 realize bridging between Wi-Fi and Bluetooth® LE?
Yes, this function is developed on the application layer. You can retrieve data through Bluetooth LE
and send them out via Wi-Fi. For detailed information, please refer to Wi-Fi and Bluetooth LE Coexist
demo.
4.1.12 What is the operating current of ESP32 Bluetooth® LE?
Current MAX (mA) Min (mA) Average (mA)
Advertising: Adv Interval = 40 ms 142.1 32 42.67
Scanning: Scan Interval = 160 ms, Window = 20 ms 142.1 32 44.4
Connection(Slave): Connection Interval = 20 ms, latency = 0 142.1 32 42.75
Connection(Slave): Connection Interval = 80 ms, latency = 0 142.1 32 35.33
4.1.13 What kinds of Bluetooth® LE proles does ESP32 support?
Currently, ESP32 Bluetooth LE fully supports some basic proles, such as GATT/SMP/GAP, as well
as some self-dened proles. The ones that have already been implemented include Bluetooth LE
HID (receiving side), Bluetooth LE SPP-Like, Battery, DIS, BluFi (Bluetooth Network Conguration-
transmitting side), and so on.
4.1.14 How do I connect mobile phones and play music using ESP32 Bluetooth®?
ESP32 is used as an A2DP receiver when connected to a cell phone to play music. Please note that the
A2DP Sink Demo uses a mobile phone to obtain SBC encoded data stream only. In order to play sounds,
you will also need to decode the data and some peripherals, including codec modules, D/A converter,
and speaker.
4.1.15 How is the ESP32 SPP performance?
When we use two ESP32 boards to run SPP, one-way throughput can reach up to 1900 Kbps (about 235
KB/s), which is close to the theoretical value in the specications.
Espressif Systems 45
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