Added printing of log priority in syslog.

drivers/syslog/Kconfig

@@ -142,6 +142,12 @@ config SYSLOG_TIMESTAMP_BUFFER
 	---help---
 		Buffer size to store syslog formatted timestamps.
 
+config SYSLOG_PRIORITY
+	bool "Prepend priority to syslog message"
+	default n
+	---help---
+		Prepend log priority (severity) to syslog message.
+
 config SYSLOG_PREFIX
 	bool "Prepend prefix to syslog message"
 	default n

drivers/syslog/vsyslog.c

@@ -50,6 +50,18 @@
 #include <nuttx/streams.h>
 #include <nuttx/syslog/syslog.h>
 
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+#if defined(CONFIG_SYSLOG_PRIORITY)
+static FAR const char * g_priority_str[] =
+  {
+    "EMERG", "ALERT", "CRIT", "ERROR",
+    "WARN", "NOTICE", "INFO", "DEBUG"
+  };
+#endif
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -160,6 +172,10 @@ int nx_vsyslog(int priority, FAR const IPTR char *fmt, FAR va_list *ap)
   ret = 0;
 #endif
 
+#if defined(CONFIG_SYSLOG_PRIORITY)
+  ret += lib_sprintf(&stream.public, "[%6s] ", g_priority_str[priority]);
+#endif
+
 #if defined(CONFIG_SYSLOG_PREFIX)
   /* Pre-pend the prefix, if available */