Add sending "Switch Configuration"

Resolves #10

encoder.go

@@ -78,6 +78,14 @@ func encodeLocation(msg LocationMessage) ([]byte, error) {
 	return e.finish()
 }
 
+func encodeSwitchConfiguration(msg SwitchConfigurationMessage) ([]byte, error) {
+	e := newEncoder()
+	e.encodeUint32(switchConfigurationNum)
+	e.encodeUtf8(msg.Id)
+	e.encodeUtf8(msg.ConfigurationName)
+	return e.finish()
+}
+
 type encoder struct {
 	buf *bytes.Buffer
 }

encoder_test.go

@@ -275,3 +275,35 @@ func Test_encodeLocation(t *testing.T) {
 		})
 	}
 }
+
+func Test_encodeSwitchConfiguration(t *testing.T) {
+	type args struct {
+		msg SwitchConfigurationMessage
+	}
+	wantBin, _ := hex.DecodeString("adbccbda000000020000000e0000000657534a542d58000000184d79416c7465726e617465436f6e66696775726174696f6e")
+	tests := []struct {
+		name    string
+		args    args
+		want    []byte
+		wantErr bool
+	}{
+		{
+			name:    "encodeSwitchConfiguration",
+			args:    args{msg: SwitchConfigurationMessage{"WSJT-X", "MyAlternateConfiguration"}},
+			want:    wantBin,
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := encodeSwitchConfiguration(tt.args.msg)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("encodeSwitchConfiguration() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("encodeSwitchConfiguration() got = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

messages.go

@@ -289,3 +289,19 @@ type LoggedAdifMessage struct {
 }
 
 const loggedAdifNum = 12
+
+/*
+The server  may send  this message at  any time.   The message
+specifies the name of the  configuration to switch to. The new
+configuration must exist.
+
+In only.
+
+https://sourceforge.net/p/wsjt/wsjtx/ci/8f99fcce/tree/Network/NetworkMessage.hpp#l468
+*/
+type SwitchConfigurationMessage struct {
+	Id                string `json:"id"`
+	ConfigurationName string `json:"configurationName"`
+}
+
+const switchConfigurationNum = 14

server.go

@@ -99,6 +99,13 @@ func (s *Server) Location(msg LocationMessage) error {
 	return err
 }
 
+// Send a message to WSJT-X to switch to a different pre-defined configuration.
+func (s *Server) SwitchConfiguration(msg SwitchConfigurationMessage) error {
+	msgBytes, _ := encodeSwitchConfiguration(msg)
+	_, err := s.conn.WriteTo(msgBytes, s.remoteAddr)
+	return err
+}
+
 func check(err error) {
 	if err != nil {
 		panic(err)