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By pop48m
#95264 I would like to combine ESP-NOW and deepSleep to send data from a sensor to base controller. My code is:
Code: Select all/********************************************************************
 * ESP-NOW Sender using ESP8266
 * ESP8266 Deep sleep mode, GPIO 16 connected to the RESET (RST) pin

#include <ESP8266WiFi.h>
#include <espnow.h>
#include <Wire.h>

uint8_t broadcastAddress[] = {0x18, 0xFE, 0x34, 0xD3, 0xB0, 0x4A}; // ESP8266 No.2: 18:FE:34:D3:B0:4A

// Structure example to send data. Must match the receiver structure
typedef struct struct_message {
  float Temp;
  float Pres;
  float Hum;
} struct_message;

// Create a struct_message called myData
struct_message myData;

// Callback when data is sent
void OnDataSent(uint8_t *mac_addr, uint8_t sendStatus)
  char macStr[18];
  Serial.print("Packet to:");
  snprintf(macStr, sizeof(macStr), "%02x:%02x:%02x:%02x:%02x:%02x",
         mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3], mac_addr[4], mac_addr[5]);
  Serial.print(" Send status: ");
  if (sendStatus == 0)
    Serial.println(" Delivery success");
    Serial.println(" Delivery fail");
void setup()
  // Init Serial Monitor

  // Set device as a Wi-Fi Station

  // Init ESP-NOW
  if (esp_now_init() != 0)
    Serial.println("Error initializing ESP-NOW");

  // Once ESPNow is successfully Init, we will register for Send CB to
  // get the status of Trasnmitted packet
  // Register peer
  esp_now_add_peer(broadcastAddress, ESP_NOW_ROLE_SLAVE, 1, NULL, 0);
  //esp_now_add_peer(broadcastAddress2, ESP_NOW_ROLE_SLAVE, 1, NULL, 0);
  // Set values to send
  myData.Temp = 25.1;
  myData.Pres = 1012.5;
  myData.Hum = 48.7;

  // Send message via ESP-NOW
  esp_now_send(broadcastAddress, (uint8_t *) &myData, sizeof(myData));

  // Deep sleep mode for 60 seconds, the ESP8266 wakes up by itself
  Serial.println("Going into deep sleep mode for 60 seconds");
void loop() {}

The fragment of output on serial monitor is:
17:04:53.651 -> Packet to:18:fe:34:d3:b0:4a Send status: 1 Delivery fail

But, when instruction ESP.deepSleep(60e6); is commented the output is:
15:52:42.622 -> Packet to:18:fe:34:d3:b0:4a send status: 0 Delivery success

It is interesting that in both cases the receiver gets data properly.
Any suggestions?
Kind regards.