Nimble: Enable optional debug output via RTT

This allows better debugging of the bluetooth stack.

Author: StarGate01

src/libs/mynewt-nimble/porting/nimble/include/logcfg/logcfg.h

@@ -8,7 +8,7 @@
 #include "modlog/modlog.h"
 #include "log_common/log_common.h"
 
-#define BLE_HS_LOG_DEBUG(...) IGNORE(__VA_ARGS__)
+#define BLE_HS_LOG_DEBUG(...) MODLOG_DEBUG(4, __VA_ARGS__)
 #define BLE_HS_LOG_INFO(...) MODLOG_INFO(4, __VA_ARGS__)
 #define BLE_HS_LOG_WARN(...) MODLOG_WARN(4, __VA_ARGS__)
 #define BLE_HS_LOG_ERROR(...) MODLOG_ERROR(4, __VA_ARGS__)

src/libs/mynewt-nimble/porting/nimble/include/modlog/modlog.h

@@ -20,7 +20,8 @@
 #ifndef H_MODLOG_
 #define H_MODLOG_
 
-#include <stdio.h>
+#include "SEGGER_RTT.h"
+#define printf(...) SEGGER_RTT_printf(0, __VA_ARGS__)
 
 #include "log_common/log_common.h"
 #include "log/log.h"