Added Pagianation for Sending Payload

- Cut of 1 Byte for Pagination
- Now we can send 256 Datapackages without chaning any logic from
  sending and receiving
- We have 250 Bytes from ESP NOW
- We use 10 Byte for Meta Data, 1 for Pagination
- We have 239 Bytes for Real Payload

main/main.c

@@ -13,6 +13,7 @@
 #include "nvs_flash.h"
 #include "portmacro.h"
 #include <assert.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <string.h>
 
@@ -71,7 +72,6 @@ void espnow_data_prepare(espnow_send_param_t *send_param) {
   espnow_data_t *buf = (espnow_data_t *)send_param->buffer;
 
   ESP_LOGI(tag, "Example_Data_SIZE: %u, send_param_len: %d\n", sizeof(espnow_data_t), send_param->len);
-
   assert(send_param->len >= sizeof(espnow_data_t));
 
   buf->type = IS_BROADCAST_ADDR(send_param->dest_mac)
@@ -81,10 +81,8 @@ void espnow_data_prepare(espnow_send_param_t *send_param) {
   buf->seq_num = s_espnow_seq[buf->type]++;
   buf->crc = 0;
   buf->magic = send_param->magic;
-  buf->payload.isMaster = isMaster;
-  /* Fill all remaining bytes after the data with random values */
-  /* esp_fill_random(buf->payload,
-                  send_param->len - sizeof(espnow_data_t)); */ // wieso sollte ich das mit random daten füllen
+  buf->unionPage = UNION_STATUS;
+  buf->realPayload.status.isMaster = isMaster;
 
   buf->crc = esp_crc16_le(UINT16_MAX, (uint8_t const *)buf, send_param->len);
 }
@@ -161,7 +159,7 @@ int espnow_data_parse(uint8_t *data, uint16_t data_len, uint8_t *state,
   buf->crc = 0;
   crc_cal = esp_crc16_le(UINT16_MAX, (uint8_t const *)buf, data_len);
 
-  if(buf->payload.isMaster) {
+  if(buf->realPayload.status.isMaster) {
     ESP_LOGI(tag, "Recived Data from Master");
   } else {
     ESP_LOGI(tag, "Recived Data from Slave");

main/main.h

@@ -1,6 +1,7 @@
 #ifndef MAIN_H
 #define MAIN_H
 
+#include <stdint.h>
 #define Master_SlavePin 23
 #define MAX_PAYLOAD_SIZE 250
 
@@ -42,9 +43,23 @@ enum {
   EXAMPLE_ESPNOW_DATA_MAX,
 };
 
+enum {
+  UNION_STATUS,
+  UNION_SENSORDATA,
+};
+
 typedef struct {
   bool isMaster;
-} __attribute__((packed)) payloadData;
+} __attribute__((packed)) payloadStatus;
+
+typedef struct {
+  uint8_t dataPoint;
+} __attribute__((packed)) payloadSensorData;
+
+union realPayload {
+  payloadStatus status;
+  payloadSensorData sensorData;
+};
 
 /* User defined field of ESPNOW data in this example. */
 typedef struct {
@@ -54,11 +69,13 @@ typedef struct {
   uint16_t crc;     // CRC16 value of ESPNOW data.
   uint32_t magic;   // Magic number which is used to determine which device to
                     // send unicast ESPNOW data.
-  payloadData payload; // Real payload of ESPNOW data.
+  uint8_t unionPage;
+  union realPayload realPayload; // Real payload of ESPNOW data.
 } __attribute__((packed)) espnow_data_t;
 
-static_assert(sizeof(espnow_data_t) <= MAX_PAYLOAD_SIZE, "payloadData struct is too big to be sent in one part, keep it under 250 Bytes!");
-
+static_assert(sizeof(espnow_data_t) <= MAX_PAYLOAD_SIZE,
+              "payloadData struct is too big to be sent in one part, keep it "
+              "under 250 Bytes!");
 
 typedef struct {
   bool unicast;   // Send unicast ESPNOW data.