# Multi-Connection Guide

[中文]

## Introduction

The following table provides an overview of the maximum number of concurrent connections supported for each ESP Bluetooth LE Host. In multi-connection scenarios, connection parameters must be configured appropriately. In general, as the number of connections increases, the connection interval should be increased accordingly. For detailed parameter configuration recommendations and SDK configuration details, please refer to the corresponding example code in the following table.

In this document, the maximum number of connections refers to the maximum number of simultaneous active connections that the device can maintain, whether operating as a central or peripheral.

### Host SDKconfig

Maximum Concurrent Connections by ESP Bluetooth LE Host
Host | Max Connections | SDKconfig | Example
--- | --- | --- | ---
ESP-Bluedroid | 9 | BT_MULTI_CONNECTION_ENBALE BT_ACL_CONNECTIONS | multi_conn
ESP-NimBLE | 9 | BT_NIMBLE_MAX_CONNECTIONS | multi_conn

### Controller SDKconfig

- BTDM_CTRL_BLE_MAX_CONN

The configuration option BTDM_CTRL_BLE_MAX_CONN specifies the maximum number of Bluetooth LE connections that the controller can support concurrently. This value must match the maximum number of connections configured on the Host side, as defined in the table above.

## Note

1. The ability to support multiple connections highly depends on the application’s overall memory usage. It is recommended to disable unnecessary features to optimize multi-connection performance.

2. When the device operates in the peripheral role, connection stability and overall performance will be influenced by the central device and the negotiated connection parameters.

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