Below is the Reciever code, but it Outputs a constant value of -93.
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#include <stdio.h>
#include <string.h>
#include <esp_log.h>
#include <esp_err.h>
#include <esp_wifi.h>
#include <esp_now.h>
#include <nvs_flash.h>
static const char *TAG = "esp_now_receiver";
// Structure example to receive data
typedef struct struct_message {
char a[32];
int b;
float c;
bool d;
} struct_message;
// Create a struct_message called myData
struct_message myData;
// Callback function that will be executed when data is received
void OnDataRecv(const uint8_t *mac_addr, const uint8_t *incomingData, int len) {
memcpy(&myData, incomingData, sizeof(myData));
// Get the RSSI value
wifi_pkt_rx_ctrl_t *pkt_ctrl = (wifi_pkt_rx_ctrl_t *)(incomingData - sizeof(wifi_pkt_rx_ctrl_t));
int8_t rssi = pkt_ctrl->rssi;
ESP_LOGI(TAG, "Bytes received: %d", len);
ESP_LOGI(TAG, "Char: %s", myData.a);
ESP_LOGI(TAG, "Int: %d", myData.b);
ESP_LOGI(TAG, "Float: %f", myData.c);
ESP_LOGI(TAG, "Bool: %s", myData.d ? "true" : "false");
ESP_LOGI(TAG, "RSSI: %d dBm", rssi);
}
void app_main(void) {
esp_err_t ret;
// Initialize NVS
ret = nvs_flash_init();
if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
ESP_ERROR_CHECK(nvs_flash_erase());
ret = nvs_flash_init();
}
ESP_ERROR_CHECK(ret);
// Initialize Wi-Fi
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK(esp_wifi_init(&cfg));
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
ESP_ERROR_CHECK(esp_wifi_start());
// Initialize ESP-NOW
ESP_ERROR_CHECK(esp_now_init());
// Register receive callback function
ESP_ERROR_CHECK(esp_now_register_recv_cb(OnDataRecv));
// Enter an infinite loop
while (1) {
vTaskDelay(pdMS_TO_TICKS(1000)); // Delay to allow background tasks to run
}
}