examples: golang

Signed-off-by: Douglas Schilling Landgraf <[email protected]>

examples/vendor-sending-real-hardware-signal-to-dbus/golang/.git_ignore

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+go.sum
+send_signal

examples/vendor-sending-real-hardware-signal-to-dbus/golang/README.md

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+golang$ go mod init send_signal
+golang$ go mod tidy
+golang$ go get github.com/godbus/dbus/v5
+golang$ go build -o send_signal main.go
+
+$ sudo ./send_signal
+Hardware signal 'Speed' with value 80.000000 sent to D-Bus.
+Signal sent successfully.

examples/vendor-sending-real-hardware-signal-to-dbus/golang/go.mod

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+module send_signal
+
+go 1.22.7
+
+require github.com/godbus/dbus/v5 v5.1.0

examples/vendor-sending-real-hardware-signal-to-dbus/golang/main.go

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+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package main
+
+import (
+	"fmt"
+	"github.com/godbus/dbus/v5"
+	"log"
+)
+
+// sendHardwareSignal sends a hardware signal to the D-Bus service.
+//
+// signalName: The name of the signal (e.g., "Speed").
+// value: The value of the signal (e.g., 80.0 for speed).
+func sendHardwareSignal(signalName string, value float64) error {
+	// Connect to the system bus
+	conn, err := dbus.SystemBus()
+	if err != nil {
+		return fmt.Errorf("failed to connect to the system bus: %v", err)
+	}
+
+	// Object to call the D-Bus method
+	obj := conn.Object("com.vss_lib.VehicleSignals", "/com/vss_lib/VehicleSignals")
+
+	// Call the EmitHardwareSignal method with signalName and value
+	call := obj.Call("com.vss_lib.VehicleSignals.EmitHardwareSignal", 0, signalName, value)
+	if call.Err != nil {
+		return fmt.Errorf("failed to send D-Bus message: %v", call.Err)
+	}
+
+	fmt.Printf("Hardware signal '%s' with value %f sent to D-Bus.\n", signalName, value)
+	return nil
+}
+
+func main() {
+	// Example: Sending real-time speed signal from hardware
+	err := sendHardwareSignal("Speed", 80.0)
+	if err != nil {
+		log.Fatalf("Error: Could not send the signal. Details: %v", err)
+	} else {
+		fmt.Println("Signal sent successfully.")
+	}
+}