// Example of a custom data structure for routing
typedef struct {
  uint8_t sourceMac[6];
  uint8_t destMac[6];
  uint8_t payload[250]; // Max payload for ESP-NOW
  // Add other routing info like hop count if needed
} esp_now_routed_message_t;

// Function to send a routed message
void sendRoutedMessage(uint8_t *destMac, uint8_t *data, size_t len) {
  esp_now_routed_message_t message;
  // Populate message.sourceMac with current node's MAC
  // Populate message.destMac with destMac
  // Copy data to message.payload

  // Determine next hop based on routing table or discovery
  uint8_t nextHopMac[6]; 
  // ... (routing logic to find nextHopMac) ...

  esp_err_t result = esp_now_send(nextHopMac, (uint8_t *)&message, sizeof(message));
  // Handle result
}

// Callback function for receiving messages
void OnDataRecv(const uint8_t *mac_addr, const uint8_t *incomingData, int len) {
  esp_now_routed_message_t *receivedMessage = (esp_now_routed_message_t *)incomingData;

  // Check if message is for this node
  if (memcmp(receivedMessage->destMac, myMacAddress, 6) == 0) {
    // Process received data
  } else {
    // Forward the message based on routing table
    sendRoutedMessage(receivedMessage->destMac, receivedMessage->payload, sizeof(receivedMessage->payload));
  }
}