added Going-to-sleep display message

src/display.cpp

@@ -345,7 +345,7 @@ void dp_drawPage(time_t t, bool nextpage) {
     dp_println();
 #endif // TIME_SYNC_INTERVAL
 
-    // line 7: LORA network status
+    // line 7: LMIC status
     // yyyyyyyyyyyyy xx SFab
 
 #if (HAS_LORA)
@@ -355,7 +355,6 @@ void dp_drawPage(time_t t, bool nextpage) {
     dp_setFont(MY_FONT_SMALL, !cfg.adrmode);
     dp_printf("%-4s", getSfName(updr2rps(LMIC.datarate)));
     dp_setFont(MY_FONT_SMALL, 0);
-    dp_println();
 #endif // HAS_LORA
     break;
 
@@ -617,6 +616,14 @@ void dp_shutdown(void) {
 #endif
 }
 
+// print static message on display
+void dp_message(const char *msg, int line, bool invers) {
+  dp_setTextCursor(0, line);
+  dp_setFont(MY_FONT_NORMAL, invers ? 1 : 0);
+  dp_printf("%-16s", msg);
+  dp_dump(displaybuf);
+} // dp_message
+
 // ------------- QR code plotter -----------------
 
 void dp_printqr(uint16_t offset_x, uint16_t offset_y, const char *Message) {

src/reset.cpp

@@ -97,6 +97,11 @@ void enter_deepsleep(const uint64_t wakeup_sec, gpio_num_t wakeup_gpio) {
   RTC_runmode = RUNMODE_SLEEP;
   int i;
 
+  // show message on display
+#ifdef HAS_DISPLAY
+  dp_message("-GOING TO SLEEP-", 7, true);
+#endif
+
   // validate wake up pin, if we have
   if (!GPIO_IS_VALID_GPIO(wakeup_gpio))
     wakeup_gpio = GPIO_NUM_MAX;
@@ -117,7 +122,7 @@ void enter_deepsleep(const uint64_t wakeup_sec, gpio_num_t wakeup_gpio) {
     vTaskDelay(pdMS_TO_TICKS(1000));
   }
 
-  // shutdown LMIC safely, waiting max 100 sec
+/// wait until LMIC is idle
 #if (HAS_LORA)
   ESP_LOGI(TAG, "Waiting until LMIC is idle...");
   for (i = 100; i > 0; i--) {