Seek forward and backward using scroll wheel in car

software/main/include/avrcp.h

@@ -9,6 +9,8 @@ namespace avrcp {
 	void play_pause();
 	void forward();
 	void backward();
+	void seek_forward();
+	void seek_backward();
 
 	void set_volume(uint8_t volume);
 }

software/main/src/avrcp.cpp

@@ -177,6 +177,18 @@ void avrcp::backward() {
 	send_cmd(ESP_AVRC_PT_CMD_BACKWARD);
 }
 
+void avrcp::seek_forward() {
+	ESP_LOGI(AVRCP_TAG, "Seek forward");
+
+	send_cmd(ESP_AVRC_PT_CMD_FAST_FORWARD);
+}
+
+void avrcp::seek_backward() {
+	ESP_LOGI(AVRCP_TAG, "Seek backward");
+
+	send_cmd(ESP_AVRC_PT_CMD_REWIND);
+}
+
 void avrcp::set_volume(uint8_t v) {
 	// Make sure the volume is actually changed
 	if (v == volume) {

software/main/src/can.cpp

@@ -336,6 +336,19 @@ static void can_task(void* params) {
 
 						static MultiPurposeButton button_backward(nullptr, avrcp::backward);
 						button_backward.update(buttons.backward);
+
+						static uint8_t scroll = 0;
+						if (scroll != buttons.scroll) {
+							int8_t diff = buttons.scroll - scroll;
+
+							if (diff < 0) {
+								avrcp::seek_backward();
+							} else {
+								avrcp::seek_forward();
+							}
+
+							scroll = buttons.scroll;
+						}
 					}
 					break;