add mqttclient to the component, and add fire stm32f429 board demo.

components/connectivity/mqttclient/common/log/format.h

@@ -0,0 +1,45 @@
+/*
+ * @Author: jiejie
+ * @Github: https://github.com/jiejieTop
+ * @Date: 2019-12-25 23:54:38
+ * @LastEditTime : 2019-12-26 20:10:28
+ * @Description: the code belongs to jiejie, please keep the author information and source code according to the license.
+ */
+#ifndef _FORMAT_H_
+#define _FORMAT_H_
+
+#include "config.h"
+#include <stdarg.h>
+
+#define FORMAT_BUF_LEN 12
+
+/* Format states */
+#define S_DEFAULT   0
+#define S_FLAGS     1
+#define S_WIDTH     2
+#define S_PRECIS    3
+#define S_LENGTH    4
+#define S_CONV      5
+
+/* Lenght flags */
+#define L_CHAR      1
+#define L_SHORT     2
+#define L_LONG      3
+#define L_LLONG     4
+#define L_DOUBLE    5
+
+#define F_ALTERNATE 0001    // put 0x infront 16, 0 on octals, b on binary
+#define F_ZEROPAD   0002    // value should be zero padded
+#define F_LEFT      0004    // left justified if set, otherwise right justified
+#define F_SPACE     0010    // place a space before positive number
+#define F_PLUS      0020    // show +/- on signed numbers, default only for -
+#define F_SIGNED    0040    // is an unsigned number?
+#define F_SMALL     0100    // use lowercase for hex?
+
+#define is_digit(c) (c >= '0' && c <= '9')
+
+int format_nstr(char *buf, unsigned int size, const char *fmt, va_list ap);
+
+
+#endif // !_FORMAT_H_
+