support custom lcm app command for ADV2 external shutdown notification

Author: michalmo

LCM/Code/App/datatypes.h

@@ -1339,7 +1339,9 @@ typedef struct __attribute__((packed)) {
 
 typedef enum {
 	FLOAT_COMMAND_ID = 101,				// float/refloat custom commands
+	LCM_COMMAND_ID = 202,					// bms custom commands
 } custom_app_data_command_ids;
+
 typedef enum {
 	FLOAT_COMMAND_GET_INFO = 0,		// get version / package info
 	FLOAT_COMMAND_GET_RTDATA = 1,	// get rt data
@@ -1404,6 +1406,10 @@ typedef enum {
 	DEBUG = 255,
 } control_commands;
 
+typedef enum {
+	LCM_COMMAND_EXTERNAL_SHUTDOWN_STATUS = 0,		// shutdown status notification
+} LCM_commands;
+
 typedef enum {
 	BOOT_DEFAULT = 0,
 	BOOT_REDWHITEBLUE = 1,

LCM/Code/App/vesc_uasrt.c

@@ -333,12 +333,34 @@ uint8_t Protocol_Parse(uint8_t * message)
 
 		case COMM_CUSTOM_APP_DATA:
 
-			if (len < 12) {
+			if (len < 3) {
 				break;
 			}
 			uint8_t magicnr = pdata[ind++];
 			uint8_t cmdid = pdata[ind++];
-			if ((magicnr != FLOAT_COMMAND_ID) || (cmdid != FLOAT_COMMAND_LCM_POLL)) {
+		
+			if (magicnr == LCM_COMMAND_ID)
+			{
+				switch(cmdid)
+				{
+					case LCM_COMMAND_EXTERNAL_SHUTDOWN_STATUS:
+					  if(len != 4) return 1;
+						if(Power_Flag == 2 &&
+							 pdata[ind] == 1)  // shutting down
+						{
+#ifdef ADV2
+							Power_Flag = 5;
+							Power_Time = 0;
+							Idle_Time = 0;
+#endif
+						}
+					break;
+				}
+
+				return 0;
+			}
+
+			if ((magicnr != FLOAT_COMMAND_ID) || (cmdid != FLOAT_COMMAND_LCM_POLL) || (len < 12)) {
 				break;
 			}
 			data.floatPackageSupported = true;