Moving HTTP gateway to a seperate package

Big rework

gateway.go

@@ -11,6 +11,16 @@ type BaseGateway struct {
 	network        *Network
 	defaultNetwork uint16
 	defaultNodeId  uint8
+	sdoBuffer      []byte
+}
+
+func NewBaseGateway(network *Network, defaultNetwork uint16, defaultNodeId uint8, sdoUploadBufferSize int) *BaseGateway {
+	return &BaseGateway{
+		network:        network,
+		defaultNetwork: defaultNetwork,
+		defaultNodeId:  defaultNodeId,
+		sdoBuffer:      make([]byte, sdoUploadBufferSize),
+	}
 }
 
 type GatewayVersion struct {
@@ -24,17 +34,27 @@ type GatewayVersion struct {
 }
 
 // Set default network to use
-func (gw *BaseGateway) SetDefaultNetwork(id uint16) error {
+func (gw *BaseGateway) SetDefaultNetworkId(id uint16) error {
 	gw.defaultNetwork = id
 	return nil
 }
 
+// Get the default network
+func (gw *BaseGateway) DefaultNetworkId() uint16 {
+	return gw.defaultNetwork
+}
+
 // Set default node Id to use
 func (gw *BaseGateway) SetDefaultNodeId(id uint8) error {
 	gw.defaultNodeId = id
 	return nil
 }
 
+// Get default node Id
+func (gw *BaseGateway) DefaultNodeId() uint8 {
+	return gw.defaultNodeId
+}
+
 // Get gateway version information
 func (gw *BaseGateway) GetVersion() (GatewayVersion, error) {
 	return GatewayVersion{}, nil
@@ -52,3 +72,27 @@ func (gw *BaseGateway) SetSDOTimeout(timeoutMs uint32) error {
 	gw.network.sdoClient.timeoutTimeBlockTransferUs = timeoutMs * 1000
 	return nil
 }
+
+// Access SDO read buffer
+func (gw *BaseGateway) Buffer() []byte {
+	return gw.sdoBuffer
+}
+
+// Read SDO
+func (gw *BaseGateway) ReadSDO(nodeId uint8, index uint16, subindex uint8) (int, error) {
+	return gw.network.ReadRaw(nodeId, index, subindex, gw.sdoBuffer)
+}
+
+// Write SDO
+func (gw *BaseGateway) WriteSDO(nodeId uint8, index uint16, subindex uint8, value string, datatype uint8) error {
+	encodedValue, err := encode(value, datatype, 0)
+	if err != nil {
+		return SDO_ABORT_TYPE_MISMATCH
+	}
+	return gw.network.WriteRaw(nodeId, index, subindex, encodedValue)
+}
+
+// Disconnect from network
+func (gw *BaseGateway) Disconnect() {
+	gw.network.Disconnect()
+}