Refactor and enhance handling of payloads and data structures

Added support for handling various payload types, including GPS and alarms, with new structures and constants. Introduced helper methods for JSON marshalling/unmarshalling of GPS data and modularized the handling of certificates, configurations, and alarms. Implemented foundational server code for testing and expanded several package functionalities.

certificate.go

@@ -23,7 +23,7 @@ const (
 
 type CertificateConnectRequest struct {
 	Net               NetConnectionType       `json:"NET"`
-	SerialNumber      string                  `json:"DNSO"`
+	SerialNumber      string                  `json:"DSNO"`
 	DeviceName        string                  `json:"DEVNAME"`
 	ChannelsNumber    uint                    `json:"CHANNEL"`
 	LicensePlate      string                  `json:"CARNUM"`
@@ -35,6 +35,25 @@ type CertificateConnectRequest struct {
 	EvidenceSupport   string                  `json:"EV"`
 }
 
+type CertificateConnectResponse struct {
+	ErrorCode   uint   `json:"ERRORCODE"`
+	ErrorCause  string `json:"ERRORCAUSE"`
+	CommandMask uint   `json:"MASKCMD"`
+}
+
+type CommandMaskParameters uint
+
+const (
+	CommandMaskAlarm = 1 << iota
+	CommandMaskScanningGun
+	CommandMaskPassengerFlow
+	CommandMaskFaceContrast
+	CommandMaskCard
+	CommandMaskShutdownReport
+	CommandMaskGPSReport
+	CommandMaskAll = 0b1111111
+)
+
 /*
 func (e *Package) RequestConnect(session string, serial string, numOfCams int) {
 	e.Payload = map[string]any{