Control Example

This example demonstrates the interaction process between the devices.

Functionality

By using the BOOT button and RGB LED on the development boards, the initiator device sends the control commands and the responder devices change the LED status when receiving the control commands.

• Press the BOOT button to send control commands
• RGB LED will display the status after receiving the commands

Hardware Required

This example can run on any ESP32 series boards and at least two development boards (for example: ESP32-S2-Saola-1 or ESP32-C3-DevKitM-1) are required. You need to use the BOOT button and RGB LED on the development boards to demonstrate.

Note: If you are using other boards, please modify the GPIOs accordingly.

How to Use the Example

Binding

Double click the BOOT button on one device, this device will send the binding command. This device acts as the initiator. When other devices receive the binding command, the RGB LED on these devices will turn green, indicating that the devices have been successfully bound. Other devices act as the responders.

Output sample from the initiator:

I (60589) app_main: initiator bind press

Output sample from the responder:

I (40550) app_main: bind, uuid: 7c:df:a1:76:42:38, initiator_type: 513

Control

Single click the BOOT button on the initiator device, this device will send the control command. When other devices receive the control command, the status of RGB LED (ON/OFF) will be controlled by the initiator device, and the color will be white.

Note: The device can only control the bound devices, so it must be bound before control.

Output sample from the initiator:

I (111469) app_main: initiator send press
I (113279) app_main: initiator send press
I (116679) app_main: initiator send press

Output sample from the responder:

I (91430) app_main: espnow_ctrl_responder_recv, initiator_attribute: 513, responder_attribute: 1, value: 1
I (93240) app_main: espnow_ctrl_responder_recv, initiator_attribute: 513, responder_attribute: 1, value: 0
I (96640) app_main: espnow_ctrl_responder_recv, initiator_attribute: 513, responder_attribute: 1, value: 1

Unbind

Long press (more than 1.5 seconds) the BOOT button on the initiator device, this device will send the unbinding command. When other devices receive the unbinding command, the RGB LED on these devices will turn red, indicating that the devices have been unbound successfully.

Output sample from the initiator:

I (158709) app_main: initiator unbind press

Output sample from the responder:

I (138670) app_main: unbind, uuid: 7c:df:a1:76:42:38, initiator_type: 513

Note

The roles of initiator and responder will be on the devices at the same time. When the user presses the BOOT button on one device, this device will act as the initiator to send commands to other devices. When other devices receive the commands, they will change the status of RGB LED to show that the command is handled.