espnow_packet.hpp

Go to the documentation of this file.

 
#pragma once
 
#include <cstdint>
 
#include "spsp/local_message.hpp"
 
namespace SPSP::LocalLayers::ESPNOW
{
    static constexpr uint8_t PROTO_VERSION     = 1;    
    static constexpr uint8_t PASSWORD_LEN      = 32;   
    static constexpr uint8_t NONCE_LEN         = 8;    
    static constexpr size_t  MAX_PACKET_LENGTH = 250;  
 
    #pragma pack(push, 1)
 
    struct PacketHeader
    {
        uint32_t ssid;              
        uint8_t nonce[NONCE_LEN];   
        uint8_t version;            
    };
 
    struct PacketPayload
    {
        LocalMessageType type;      
        uint8_t _reserved[3];       
        uint8_t checksum;           
        uint8_t topicLen;           
        uint8_t payloadLen;         
        uint8_t topicAndPayload[];  
    };
 
    struct Packet
    {
        PacketHeader header;
        PacketPayload payload;
    };
    #pragma pack(pop)
 
    // Assert sizes
    static_assert(sizeof(PacketHeader) == 13);
    static_assert(sizeof(PacketPayload) == 7);
    static_assert(sizeof(Packet) == 20);
} // namespace SPSP::LocalLayers::ESPNOW