nimble/monitor: Make console out buffer size configurable

X-Original-Commit: a2b060c0cd83c7267eea89c95b0b0e770966c1d4

nimble/host/src/ble_monitor.c

@@ -354,7 +354,7 @@ ble_monitor_log(int level, const char *fmt, ...)
 int
 ble_monitor_out(int c)
 {
-    static char buf[128];
+    static char buf[MYNEWT_VAL(BLE_MONITOR_CONSOLE_BUFFER_SIZE)];
     static size_t len;
 
     if (c != '\n' && len < sizeof(buf) - 1) {

nimble/host/syscfg.yml

@@ -72,6 +72,11 @@ syscfg.defs:
             space in RTT buffer (e.g. there is no reader connected). If disabled,
             monitor will simply block waiting for RTT to free space in buffer.
         value: 1
+    BLE_MONITOR_CONSOLE_BUFFER_SIZE:
+        description: >
+            Size of internal buffer for console output. Any line exceeding this
+            length value will be split.
+        value: 128
 
     # L2CAP settings.
     BLE_L2CAP_MAX_CHANS: