Echo the result onto serial

Example:
MMU2:1111111111111110011
1 means filament present (solid block)
0 means otherwise (dash)

Change in memory:
Flash: +94 bytes
SRAM: 0 bytes

Firmware/mmu2.cpp

@@ -298,6 +298,7 @@ bool MMU2::VerifyFilamentEnteredPTFE() {
         }
     }
 
+    TryLoadUnloadProgressbarEcho();
     TryLoadUnloadProgressbarDeinit();
 
     if (fsensorState) {

Firmware/mmu2_reporting.cpp

@@ -1,4 +1,5 @@
 #include "mmu2.h"
+#include "mmu2_log.h"
 #include "mmu2_reporting.h"
 #include "mmu2_error_converter.h"
 #include "mmu2/error_codes.h"
@@ -285,6 +286,16 @@ void TryLoadUnloadProgressbarDeinit() {
     lcd_reset_status_message_timeout();
 }
 
+void TryLoadUnloadProgressbarEcho() {
+    char buf[LCD_WIDTH + 1];
+    lcd_getstatus(buf);
+    for (uint8_t i = 0; i < sizeof(buf); i++) {
+        // Note: (unsigned char)0xFF is -1
+        buf[i] = (buf[i] < 0) ? '1' : '0';
+    }
+    MMU2_ECHO_MSGLN(buf);
+}
+
 void TryLoadUnloadProgressbar(uint8_t col, bool sensorState) {
     lcd_insert_char_into_status(col, sensorState ? '-' : LCD_STR_SOLID_BLOCK[0]);
     if (!lcd_update_enabled) lcdui_print_status_line();

Firmware/mmu2_reporting.h

@@ -38,6 +38,9 @@ void TryLoadUnloadProgressbarInit();
 /// @brief Clear the status line and setup the LCD cursor
 void TryLoadUnloadProgressbarDeinit();
 
+/// @brief Report the results to serial
+void TryLoadUnloadProgressbarEcho();
+
 /// @brief Add one block to the progress bar
 /// @param col pixel position on the LCD status line, should range from 0 to (LCD_WIDTH - 1)
 /// @param sensorState if true, filament is not present, else filament is present. This controls which character to render

Firmware/ultralcd.cpp

@@ -7204,6 +7204,10 @@ void lcd_clearstatus()
     lcd_status_message_idx = 0;
 }
 
+void lcd_getstatus(char buf[LCD_WIDTH + 1]) {
+    strncpy(buf, lcd_status_message, sizeof(lcd_status_message));
+}
+
 void lcd_setstatuspgm(const char* message)
 {
     if (lcd_message_check(LCD_STATUS_NONE))

Firmware/ultralcd.h

@@ -22,6 +22,10 @@ void ultralcd_init();
 // Set the current status message (equivalent to LCD_STATUS_NONE)
 void lcdui_print_status_line(void);
 void lcd_clearstatus();
+
+/// @brief Copy the contents of lcd_status_message
+/// @param buf destination buffer
+void lcd_getstatus(char buf[LCD_WIDTH + 1]);
 void lcd_insert_char_into_status(uint8_t position, const char message);
 void lcd_setstatus(const char* message);
 void lcd_setstatuspgm(const char* message);