HomeSpan/src/HomeSpan.h

#include <Arduino.h>

#include "Settings.h"

using std::vector;

enum statusCode {                  // HAP Table 6-11
  SC_OK=0,
  SC_Unable=-70402,
  SC_Busy=-70403,
  SC_ReadOnly=-70404,
  SC_WriteOnly=-70405,
  SC_NotifyNotAllowed=-70406,
  SC_UnknownResource=-70409,
  SC_InvalidValue=-70410,
  SC_TBD=-1                       // status To-Be-Determined (TBD) once service.update() called
};

enum {
  GET_AID=1,
  GET_META=2,
  GET_PERMS=4,
  GET_TYPE=8,
  GET_EV=16,
  GET_DESC=32,
  GET_ALL=255
};

// Forward-Declarations

struct Span;
struct SpanAccessory;
struct SpanService;
struct SpanCharacteristic;
struct SpanRange;
struct SpanPut;
struct SpanPBList;

///////////////////////////////

struct SpanConfig {                         
  int configNumber=0;                         // configuration number - broadcast as Bonjour "c#" (computed automatically)
  uint8_t hashCode[48]={0};                   // SHA-384 hash of Span Database stored as a form of unique "signature" to know when to update the config number upon changes
};

///////////////////////////////

struct Span{

  char *displayName;                            // display name for this device - broadcast as part of Bonjour MDNS
  char *hostNameBase;                           // base of host name of this device - full host name broadcast by Bonjour MDNS will have 6-byte accessoryID as well as '.local' automatically appended
  char *modelName;                              // model name of this device - broadcast as Bonjour field "md" 
  char category[3]="";                          // category ID of primary accessory - broadcast as Bonjour field "ci" (HAP Section 13)

  int resetPin=21;                              // drive this pin low to "factory" reset NVS data on start-up
  
  SpanPBList *pbHead=NULL;                      // head of linked-list of characteristics to auto-turnoff after they are turned on (to emulate a single-shot PushButton)
  SpanConfig hapConfig;                         // track configuration changes to the HAP Accessory database; used to increment the configuration number (c#) when changes found
  vector<SpanAccessory *> Accessories;          // vector of pointers to all Accessories
  
  void begin(Category catID,
             char *displayName="HomeSpan Server",
             char *hostNameBase="homespan",
             char *modelName="HS-ESP32");        
             
  void poll();                                  // poll HAP Clients and process any new HAP requests
  int getFreeSlot();                            // returns free HAPClient slot number. HAPClients slot keep track of each active HAPClient connection
  void initWifi();                              // initialize and connect to WiFi network
  void processSerialCommand(char *c);           // process command 'c' (typically from readSerial, though can be called with any 'c')

  int sprintfAttributes(char *cBuf);            // prints Attributes JSON database into buf, unless buf=NULL; return number of characters printed, excluding null terminator, even if buf=NULL
  void prettyPrint(char *buf, int nsp=2);       // print arbitrary JSON from buf to serial monitor, formatted with indentions of 'nsp' spaces
  SpanCharacteristic *find(int aid, int iid);   // return Characteristic with matching aid and iid (else NULL if not found)
  
  int countCharacteristics(char *buf);                                    // return number of characteristic objects referenced in PUT /characteristics JSON request
  int updateCharacteristics(char *buf, SpanPut *pObj);                    // parses PUT /characteristics JSON request 'buf into 'pObj' and updates referenced characteristics; returns 1 on success, 0 on fail
  int sprintfAttributes(SpanPut *pObj, int nObj, char *cBuf);             // prints SpanPut object into buf, unless buf=NULL; return number of characters printed, excluding null terminator, even if buf=NULL
  int sprintfAttributes(char **ids, int numIDs, int flags, char *cBuf);   // prints accessory.characteristic ids into buf, unless buf=NULL; return number of characters printed, excluding null terminator, even if buf=NULL

  void clearNotify(int slotNum);                                                         // set ev notification flags for connection 'slotNum' to false across all characteristics 
  int sprintfNotify(SpanPut *pObj, int nObj, char *cBuf, int conNum, int &numNotify);    // prints notification JSON into buf based on SpanPut objects and specified connection number

  void setResetPin(int pin){resetPin=pin;}      // sets new pin to be used for factory reset

};

///////////////////////////////

struct SpanAccessory{
    
  int aid=0;                                // Accessory Instance ID (HAP Table 6-1)
  int iidCount=0;                           // running count of iid to use for Services and Characteristics associated with this Accessory                                 
  vector<SpanService *> Services;           // vector of pointers to all Services in this Accessory  

  SpanAccessory();

  int sprintfAttributes(char *cBuf);        // prints Accessory JSON database into buf, unless buf=NULL; return number of characters printed, excluding null terminator, even if buf=NULL  
};

///////////////////////////////

struct SpanService{

  int iid=0;                                              // Instance ID (HAP Table 6-2)
  const char *type;                                       // Service Type
  boolean hidden=false;                                   // optional property indicating service is hidden
  boolean primary=false;                                  // optional property indicating service is primary
  vector<SpanCharacteristic *> Characteristics;           // vector of pointers to all Characteristics in this Service  
  
  SpanService(const char *type, ServiceType mod=ServiceType::Regular);

  int sprintfAttributes(char *cBuf);                      // prints Service JSON records into buf; return number of characters printed, excluding null terminator
  virtual statusCode update() {return(SC_OK);}            // update Service and return final statusCode based on updated Characteristics - should be overridden by DEVICE-SPECIFIC Services
};

///////////////////////////////

struct SpanCharacteristic{

  enum {          // create bitflags based on HAP Table 6-4
    PR=1,
    PW=2,
    EV=4,
    AA=8,
    TW=16,
    HD=32,
    WR=64
  };

  enum FORMAT {                           // HAP Table 6-5
    BOOL,
    UINT8,
    UINT16,
    UINT32,
    UINT64,
    INT,
    FLOAT,
    STRING
    };
    
  union UVal {                                  
    boolean BOOL;
    uint8_t UINT8;
    uint16_t UINT16;
    uint32_t UINT32;
    uint64_t UINT64;
    int32_t INT;
    double FLOAT;
    const char *STRING;      
  };
     
  int iid=0;                               // Instance ID (HAP Table 6-3)
  char *type;                              // Characteristic Type
  UVal value;                              // Characteristic Value
  uint8_t perms;                           // Characteristic Permissions
  FORMAT format;                           // Characteristic Format        
  char *desc=NULL;                         // Characteristic Description (optional)
  SpanRange *range=NULL;                   // Characteristic min/max/step; NULL = default values (optional)
  boolean ev[MAX_CONNECTIONS]={false};     // Characteristic Event Notify Enable (per-connection)
  
  int aid=0;                               // Accessory ID - passed through from Service containing this Characteristic
  boolean isUpdated=false;                 // set to true when new value has been requested by PUT /characteristic
  UVal newValue;                           // the updated value requested by PUT /characteristic
  SpanService *service=NULL;               // pointer to Service containing this Characteristic
      
  SpanCharacteristic(char *type, uint8_t perms);
  SpanCharacteristic(char *type, uint8_t perms, boolean value);
  SpanCharacteristic(char *type, uint8_t perms, uint8_t value);
  SpanCharacteristic(char *type, uint8_t perms, uint16_t value);
  SpanCharacteristic(char *type, uint8_t perms, uint32_t value);
  SpanCharacteristic(char *type, uint8_t perms, uint64_t value);
  SpanCharacteristic(char *type, uint8_t perms, int32_t value);
  SpanCharacteristic(char *type, uint8_t perms, double value);
  SpanCharacteristic(char *type, uint8_t perms, const char* value);

  int sprintfAttributes(char *cBuf, int flags);   // prints Characteristic JSON records into buf, according to flags mask; return number of characters printed, excluding null terminator  
  statusCode loadUpdate(char *val, char *ev);     // load updated val/ev from PUT /characteristic JSON request.  Return intiial HAP status code (checks to see if characteristic is found, is writable, etc.)
  void autoOff(int waitTime=250);                 // turns Characteristic off (false) automatically after waitTime milliseconds; only applicable to BOOL characteristics
};

///////////////////////////////

struct SpanRange{
  int min;
  int max;
  int step;

  SpanRange(int _min, int _max, int _step) : min{_min}, max{_max}, step{_step} {};
};

///////////////////////////////

struct SpanPut{                               // storage to process PUT /characteristics request
  int aid;                                    // aid to update
  int iid;                                    // iid to update
  char *val=NULL;                             // updated value (optional, though either at least 'val' or 'ev' must be specified)
  char *ev=NULL;                              // updated event notification flag (optional, though either at least 'val' or 'ev' must be specified)
  statusCode status;                          // return status (HAP Table 6-11)
  SpanCharacteristic *characteristic=NULL;    // Characteristic to update (NULL if not found)
};
  
///////////////////////////////

struct SpanPBList{
  SpanPBList *next=NULL;                      // next item in linked-list
  SpanCharacteristic *characteristic;         // characteristic to auto-turnoff whenever activated
  int waitTime;                               // time to wait until auto-turnoff (in milliseconds)
  unsigned long alarmTime;                    // alarm time for trigger to auto-turnoff
  boolean start=false;                        // alarm timer started
  boolean trigger=false;                      // alarm timer triggered
};


/////////////////////////////////////////////////
// Extern Variables

extern Span homeSpan;

/////////////////////////////////////////////////

#include "Services.h"