Chapter 4. Software framework
4.1.20 Is ESP32 Bluetooth® compatible to Bluetooth® ver2.1 + EDR protocol?
Yes. The ESP32 Bluetooth is downward-compatible, you can do tests using our ocial Bluetooth ex-
amples.
4.1.21 How many Bluetooth® clients can be connected to ESP32?
The Bluetooth LE server supports up to nine client connections, please check the conguration of pa-
rameter ble_max_conn for applications. For stable connection, three clients should be good.
4.1.22 How can I get the MAC address of Bluetooth® devices for ESP32?
You can get the MAC address congured by Bluetooth via API esp_bt_dev_get_address(void);,
also the system pre-dened MAC address types via API esp_err_t esp_read_mac(uint8_t*
mac,esp_mac_type_ttype);.
4.1.23 What is the default Bluetooth® transmit power for ESP32 SDK?
• By default, the power level of ESP32 SDK is 5, and the corresponding transmit power is +3 dBm.
• The power level of ESP32 Bluetooth ranges from 0 to 7, with the corresponding transmit power ranges from
-12 dBm to 9 dBm. Each time the power level increases by 1, the corresponding transmit power will increase
by 3 dBm.
4.1.24 Is it possible to use Wi-Fi Smartcong and Bluetooth® LE Mesh for ESP32 si-
multaneously?
It is not recommended to use them simultaneously.
• The Smartcong will need to receive the networking data, thus occupying the antenna all the time.
If it is used together with Bluetooth LE Mesh, there will be an extremely high rate of failure.
• The Bluetooth LE Mesh can be used together with BluFi. So it is recommended to use BluFi for
networking.
4.1.25 What is the operating current for ESP32 Classic Bluetooth®？
A2DP (Single core CPU 160 Mhz，DFS = false，commit a7a90f)
Current Maximum (mA) Minimum (mA) Average (mA)
Scanning 106.4 30.8 37.8
Sni 107.6 31.1 32.2
Play Music 123 90.1 100.4
Espressif Systems 47
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