MeshCoreTel-firmware/examples/simple_room_server/MyMesh.h

#pragma once

#include <Arduino.h>   // needed for PlatformIO
#include <Mesh.h>

#if defined(NRF52_PLATFORM)
  #include <InternalFileSystem.h>
#elif defined(RP2040_PLATFORM)
  #include <LittleFS.h>
#elif defined(ESP32)
  #include <SPIFFS.h>
#endif

#include <helpers/ArduinoHelpers.h>
#include <helpers/StaticPoolPacketManager.h>
#include <helpers/SimpleMeshTables.h>
#include <helpers/IdentityStore.h>
#include <helpers/AdvertDataHelpers.h>
#include <helpers/TxtDataHelpers.h>
#include <helpers/CommonCLI.h>
#include <RTClib.h>
#include <target.h>

/* ------------------------------ Config -------------------------------- */

#ifndef FIRMWARE_BUILD_DATE
  #define FIRMWARE_BUILD_DATE   "1 Sep 2025"
#endif

#ifndef FIRMWARE_VERSION
  #define FIRMWARE_VERSION   "v1.8.1"
#endif

#ifndef LORA_FREQ
  #define LORA_FREQ   915.0
#endif
#ifndef LORA_BW
  #define LORA_BW     250
#endif
#ifndef LORA_SF
  #define LORA_SF     10
#endif
#ifndef LORA_CR
  #define LORA_CR      5
#endif
#ifndef LORA_TX_POWER
  #define LORA_TX_POWER  20
#endif

#ifndef ADVERT_NAME
  #define  ADVERT_NAME   "Test BBS"
#endif
#ifndef ADVERT_LAT
  #define  ADVERT_LAT  0.0
#endif
#ifndef ADVERT_LON
  #define  ADVERT_LON  0.0
#endif

#ifndef ADMIN_PASSWORD
  #define  ADMIN_PASSWORD  "password"
#endif

#ifndef MAX_CLIENTS
 #define MAX_CLIENTS           32
#endif

#ifndef MAX_UNSYNCED_POSTS
  #define MAX_UNSYNCED_POSTS    32
#endif

#ifndef SERVER_RESPONSE_DELAY
  #define SERVER_RESPONSE_DELAY   300
#endif

#ifndef TXT_ACK_DELAY
  #define TXT_ACK_DELAY     200
#endif

#define FIRMWARE_ROLE "room_server"

#define PACKET_LOG_FILE  "/packet_log"

enum RoomPermission {
  ADMIN,
  GUEST,
  READ_ONLY
};

struct ClientInfo {
  mesh::Identity id;
  uint32_t last_timestamp;  // by THEIR clock
  uint32_t last_activity;   // by OUR clock
  uint32_t sync_since;  // sync messages SINCE this timestamp (by OUR clock)
  uint32_t pending_ack;
  uint32_t push_post_timestamp;
  unsigned long ack_timeout;
  RoomPermission  permission;
  uint8_t  push_failures;
  uint8_t  secret[PUB_KEY_SIZE];
  int      out_path_len;
  uint8_t  out_path[MAX_PATH_SIZE];
};

#define MAX_POST_TEXT_LEN    (160-9)

struct PostInfo {
  mesh::Identity author;
  uint32_t post_timestamp;   // by OUR clock
  char text[MAX_POST_TEXT_LEN+1];
};

class MyMesh : public mesh::Mesh, public CommonCLICallbacks {
  FILESYSTEM* _fs;
  unsigned long next_local_advert, next_flood_advert;
  bool _logging;
  NodePrefs _prefs;
  CommonCLI _cli;
  uint8_t reply_data[MAX_PACKET_PAYLOAD];
  int num_clients;
  ClientInfo known_clients[MAX_CLIENTS];
  unsigned long next_push;
  uint16_t _num_posted, _num_post_pushes;
  int next_client_idx;  // for round-robin polling
  int next_post_idx;
  PostInfo posts[MAX_UNSYNCED_POSTS];   // cyclic queue
  CayenneLPP telemetry;
  unsigned long set_radio_at, revert_radio_at;
  float pending_freq;
  float pending_bw;
  uint8_t pending_sf;
  uint8_t pending_cr;
  int  matching_peer_indexes[MAX_CLIENTS];

  ClientInfo* putClient(const mesh::Identity& id);
  void  evict(ClientInfo* client);
  void addPost(ClientInfo* client, const char* postData);
  void pushPostToClient(ClientInfo* client, PostInfo& post);
  uint8_t getUnsyncedCount(ClientInfo* client);
  bool processAck(const uint8_t *data);
  mesh::Packet* createSelfAdvert();
  File openAppend(const char* fname);
  int handleRequest(ClientInfo* sender, uint32_t sender_timestamp, uint8_t* payload, size_t payload_len);

protected:
  float getAirtimeBudgetFactor() const override {
    return _prefs.airtime_factor;
  }

  void logRxRaw(float snr, float rssi, const uint8_t raw[], int len) override;
  void logRx(mesh::Packet* pkt, int len, float score) override;
  void logTx(mesh::Packet* pkt, int len) override;
  void logTxFail(mesh::Packet* pkt, int len) override;

  int calcRxDelay(float score, uint32_t air_time) const override;
  const char* getLogDateTime() override;
  uint32_t getRetransmitDelay(const mesh::Packet* packet) override;
  uint32_t getDirectRetransmitDelay(const mesh::Packet* packet) override;

  int getInterferenceThreshold() const override {
    return _prefs.interference_threshold;
  }
  int getAGCResetInterval() const override {
    return ((int)_prefs.agc_reset_interval) * 4000;   // milliseconds
  }
  uint8_t getExtraAckTransmitCount() const override {
    return _prefs.multi_acks;
  }

  bool allowPacketForward(const mesh::Packet* packet) override;
  void onAnonDataRecv(mesh::Packet* packet, const uint8_t* secret, const mesh::Identity& sender, uint8_t* data, size_t len) override;
  int searchPeersByHash(const uint8_t* hash) override ;
  void getPeerSharedSecret(uint8_t* dest_secret, int peer_idx) override;
  void onPeerDataRecv(mesh::Packet* packet, uint8_t type, int sender_idx, const uint8_t* secret, uint8_t* data, size_t len) override;
  bool onPeerPathRecv(mesh::Packet* packet, int sender_idx, const uint8_t* secret, uint8_t* path, uint8_t path_len, uint8_t extra_type, uint8_t* extra, uint8_t extra_len) override;
  void onAckRecv(mesh::Packet* packet, uint32_t ack_crc) override;

public:
  MyMesh(mesh::MainBoard& board, mesh::Radio& radio, mesh::MillisecondClock& ms, mesh::RNG& rng, mesh::RTCClock& rtc, mesh::MeshTables& tables);

  void begin(FILESYSTEM* fs);

  const char* getFirmwareVer() override { return FIRMWARE_VERSION; }
  const char* getBuildDate() override { return FIRMWARE_BUILD_DATE; }
  const char* getRole() override { return FIRMWARE_ROLE; }
  const char* getNodeName() { return _prefs.node_name; }
  NodePrefs* getNodePrefs() {
    return &_prefs;
  }

  void savePrefs() override {
    _cli.savePrefs(_fs);
  }

  void applyTempRadioParams(float freq, float bw, uint8_t sf, uint8_t cr, int timeout_mins) override;
  bool formatFileSystem() override;
  void sendSelfAdvertisement(int delay_millis) override;
  void updateAdvertTimer() override;
  void updateFloodAdvertTimer() override;

  void setLoggingOn(bool enable) override { _logging = enable; }

  void eraseLogFile() override {
    _fs->remove(PACKET_LOG_FILE);
  }

  void dumpLogFile() override;
  void setTxPower(uint8_t power_dbm) override;

  void formatNeighborsReply(char *reply) override {
    strcpy(reply, "not supported");
  }

  mesh::LocalIdentity& getSelfId() override { return self_id; }

  void saveIdentity(const mesh::LocalIdentity& new_id) override;
  void clearStats() override;
  void handleCommand(uint32_t sender_timestamp, char* command, char* reply);
  void loop();
};