make debug console stall until host has downloaded

src/RedirectablePrint.cpp

@@ -20,7 +20,7 @@ size_t RedirectablePrint::write(uint8_t c)
 {
     // Always send the characters to our segger JTAG debugger
 #ifdef SEGGER_STDOUT_CH
-    SEGGER_RTT_PutCharSkip(SEGGER_STDOUT_CH, c);
+    SEGGER_RTT_PutChar(SEGGER_STDOUT_CH, c);
 #endif
 
     dest->write(c);
@@ -85,6 +85,8 @@ size_t RedirectablePrint::logDebug(const char *format, ...)
         auto thread = concurrency::OSThread::currentThread;
         if(thread) {
             print("[");
+            // printf("%p ", thread);
+            // assert(thread->ThreadName.length());
             print(thread->ThreadName);
             print("] ");
         }

src/main.cpp

@@ -279,7 +279,13 @@ void setup()
     concurrency::hasBeenSetup = true;
 
 #ifdef SEGGER_STDOUT_CH
-    SEGGER_RTT_ConfigUpBuffer(SEGGER_STDOUT_CH, NULL, NULL, 1024, SEGGER_RTT_MODE_NO_BLOCK_TRIM);
+    auto mode = true ? SEGGER_RTT_MODE_BLOCK_IF_FIFO_FULL : SEGGER_RTT_MODE_NO_BLOCK_TRIM;
+#ifdef NRF52840_XXAA
+    auto buflen = 4096; // this board has a fair amount of ram
+#else
+    auto buflen = 256; // this board has a fair amount of ram
+#endif
+    SEGGER_RTT_ConfigUpBuffer(SEGGER_STDOUT_CH, NULL, NULL, buflen, mode);
 #endif
 
 #ifdef USE_SEGGER