docs: Update README.md

README.md

@@ -57,7 +57,7 @@ Provides some applications using CSI data, including RainMaker cloud reporting a
 
 <img src="docs/_static/get_device_csi.png" width="550">
 
-- **How ​​to implement:** ESP32 A and B both send Ping packets to the router, and ESP32 A receives the CSI information carried in the Ping Replay returned by ESP32 B, which is a supplement to the first detection scenario.
+- **How ​​to implement:** ESP32 B and C both send Ping packets to the router, and ESP32 B receives the CSI information carried in the Ping Replay returned by ESP32 C, which is a supplement to the first detection scenario.
 - **Advantage:** Does not depend on the location of the router, and is not affected by other devices connected under the router.
 - **Disadvantage:** Depends on the Wi-Fi protocol supported by the router, environment.
 - **Applicable scenario:** There must be more than two ESP32s in the environment.
@@ -66,7 +66,7 @@ Provides some applications using CSI data, including RainMaker cloud reporting a
 
 <img src="docs/_static/get_broadcast_csi.png" width="550">
 
-- **How ​​to implement:** The packet sending device continuously switches channels to send out packets. ESP32 A, B, and C all obtain the CSI information carried in the broadcast packet of the packet sending device. This method has the highest detection accuracy and reliability.
+- **How ​​to implement:** The packet sending device continuously switches channels to send out packets. ESP32 B, C, and D all obtain the CSI information carried in the broadcast packet of the packet sending device. This method has the highest detection accuracy and reliability.
 - **Advantages:** The completion is not affected by the router, and the detection accuracy is high. When there are multiple devices in the environment, only one packet sending device will cause little interference to the network environment.
 - **Disadvantages:** In addition to the ordinary ESP32, it is also necessary to add a special package issuing equipment, the cost is the same and higher.
 - **Applicable scenarios:** Suitable for scenarios that require high accuracy and multi-device cluster positioning.