Implementing Mesh Network with ESPNOW in IDF Example (IDFGH-14842)

[gajananmaske1234]

Is your feature request related to a problem?

Hi,

I am currently using the ESPNOW code from the IDF example and want to implement a mesh network scenario. In this setup, I have three devices: Slave 1, Slave 2, and Master. The issue is that Slave 2 is out of range from the Master, but in range with Slave 1.

My goal is to have Slave 2 send a message through Slave 1 to the Master, so that even though Slave 2 is out of range from the Master, it can still communicate via Slave 1.

Could you please guide me on how to modify the code to implement this functionality, where Slave 1 forwards the message from Slave 2 to the Master?

Thanks in advance for your assistance!

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Describe alternatives you've considered.

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Additional context.

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[nopnop2002]

Here is the esp-mesh-lite user guide.
This includes the ESPNOW Usage Guide.
Perhaps it is possible with esp-mesh-lite.
Unfortunately, it does not include sample code for ESPNOW.

https://github.com/espressif/esp-mesh-lite/blob/master/components/mesh_lite/User_Guide.md#espnow-usage-guide

[gajananmaske1234]

Thanks for your response,

I am able to do mesh network using above code.

Now i want to use API of ESPNOW

receive api for master :

/ Callback function to handle received data
void recv_cb(const esp_now_recv_info_t *info, const uint8_t *data, int len) {

ESP_LOGI(TAG, "Received from %02X:%02X:%02X:%02X:%02X:%02X: %.*s",
         info->src_addr[0], info->src_addr[1], info->src_addr[2], 
         info->src_addr[3], info->src_addr[4], info->src_addr[5],
         len, data);

// Ensure slave is added as a peer
add_peer_if_needed(info->src_addr);

}

Send api slave 1 & slave 2:

// Function to send data (MAC + Device Number)
void send_data_to_master(void *pvParameter) {
uint8_t device_mac[ESP_NOW_ETH_ALEN];
esp_wifi_get_mac(ESP_IF_WIFI_STA, device_mac);

while (1) {
    // Prepare data (MAC + device number)
    char data[120];
 
    int written_bytes = snprintf(data, sizeof(data), "\nDevice No: %d \nMAC: %02X:%02X:%02X:%02X:%02X:%02X\nData : %s:%d\n"  ,
             DEVICE_NUMBER,
             device_mac[0], device_mac[1], device_mac[2],
             device_mac[3], device_mac[4], device_mac[5],"Testing 100 bytes data slave device No",DEVICE_NUMBER);

             uint8_t actual_data_length = strlen(data);
             
             
             snprintf(data + written_bytes, sizeof(data) - written_bytes, "Data written: %d\n", actual_data_length);
             

    // Send data to master
    esp_err_t result = esp_now_send(master_mac, (uint8_t *)data, strlen(data));
    if (result == ESP_OK) {
        ESP_LOGI(TAG, "Data sent: %s", data);
    } else {
        ESP_LOGE(TAG, "Failed to send data");
    }

    vTaskDelay(pdMS_TO_TICKS(2000));  // Delay for 2 seconds
}

}

Is there an available example?

The mesh structure should be followed for sending messages through the slave device if any slave is out of range.

Thanks in advance.

[zhangyanjiaoesp]

@gajananmaske1234 you can refer to this :
https://github.com/espressif/esp-mesh-lite/blob/master/examples/rainmaker/led_light/components/group_control/app_espnow.c

[gajananmaske1234]

Thanks for your response,

As shown in above diagram I am using mesh lite example and espnow and send receive API.

Now using esp lite example i am expecting master to layer 2 device should communicate through Slave 1 device but not working as expected.

slave to connecting with slave1 as a child confirmed in logs.

Want to know can i do communication as above if yes then how? is there any example please guide.