firmware/src/mesh/MeshTypes.h

#pragma once

// low level types

#include "MemoryPool.h"
#include "mesh/mesh-pb-constants.h"
#include <Arduino.h>

typedef uint32_t NodeNum;
typedef uint32_t PacketId; // A packet sequence number

#define NODENUM_BROADCAST UINT32_MAX
#define ERRNO_OK 0
#define ERRNO_NO_INTERFACES 33
#define ERRNO_UNKNOWN 32  // pick something that doesn't conflict with RH_ROUTER_ERROR_UNABLE_TO_DELIVER
#define ERRNO_DISABLED 34 // the interface is disabled

/*
 * Source of a received message
 */
enum RxSource {
    RX_SRC_LOCAL, // message was generated locally
    RX_SRC_RADIO, // message was received from radio mesh
    RX_SRC_USER   // message was received from end-user device
};

/**
 * the max number of hops a message can pass through, used as the default max for hop_limit in MeshPacket.
 *
 * We reserve 3 bits in the header so this could be up to 7, but given the high range of lora and typical usecases, keeping
 * maxhops to 3 should be fine for a while.  This also serves to prevent routing/flooding attempts to be attempted for
 * too long.
 **/
#define HOP_MAX 7

/// We normally just use max 3 hops for sending reliable messages
#define HOP_RELIABLE 3

typedef int ErrorCode;

/// Alloc and free packets to our global, ISR safe pool
extern Allocator<meshtastic_MeshPacket> &packetPool;

/**
 * Most (but not always) of the time we want to treat packets 'from' the local phone (where from == 0), as if they originated on
 * the local node. If from is zero this function returns our node number instead
 */
NodeNum getFrom(const meshtastic_MeshPacket *p);