https://github.com/espressif/esp-hosted

ESP-Hosted solutionESP-Hosted project provides a way to use ESP32 or ESP32-S2 (termed as ESP peripheral) as a communication processor for Wi-Fi and Bluetooth/BLE connectivity. On the host side, ESP-Hosted offers a standard network interface for receiving and transmitting 802.3 frames. On top of the network interface, the host can use its own TCP/IP and TLS stack. For BT connectivity, a standard HCI interface is exposed to the Bluetooth host stack.

Please note that this project doesn't provide a standard 802.11 interface to the host. For the control path between the host and ESP peripheral, ESP-Hosted uses a custom implementation based on Protobuf.

Connectivity SupportESP hosted solution provides following WLAN and BT/BLE features to host:

WLAN Features:802.11b/g/nWLAN StationWLAN Soft APBT/BLE Features:v4.2 BR/EDR and BLESupported HostsESP-Hosted solution supports microprocessors running Linux as well as STM32 MCU (STM32F469I). It's possible to port this relatively easily on other MCUs too. We support Raspberry-Pi (3 Model B+, 4 Model B) and STM32 Discovery Board (STM32F469I-DISCO) out of the box.

Supported TransportsESP-Hosted uses SDIO or SPI interface as a transport interface for data and control path. The host acts as SDIO or SPI host whereas ESP32 or ESP32-S2 acts as a corresponding ESP peripheral. Currently Raspberry Pi supports both SDIO and SPI transport and STM32 supports SPI transport. As a peripheral device, ESP32 supports both SDIO and SPI transport interfaces and ESP32-S2 supports SPI transport interface.

For detailed explanation, please go through -

Using Raspberry-Pi as a Linux hostUsing STM32F469I-DISCO as a MCU hostFeature MatrixLinux HostBelow table explains which feature is supported on which transport interface for Linux based host.

ESP device    Transport Interface    WLAN support    Virtual serial interface    BT/BLE supportESP32    SDIO    Yes    Yes    YesESP32    SPI    Yes    Yes    YesESP32    UART    No    No    YesESP32-S2    SDIO    NA    NA    NAESP32-S2    SPI    Yes    Yes    NAESP32-S2    UART    No    No    NAMCU HostBelow table explains which feature is supported on which transport interface for MCU based host.

ESP device    Transport Interface    WLAN support    Virtual serial interface    BT/BLE supportESP32    SDIO    No    No    NoESP32    SPI    Yes    Yes    HCI interface can be implemented over virtual serial interfaceESP32    UART    No    No    NoESP32-S2    SDIO    NA    NA    NAESP32-S2    SPI    Yes    Yes    NAESP32-S2    UART    No    No    NA