xbee: Initial implementation

This is a basic serial module that allows access to various XBee
devices via a UART port.  It was tested with the XBee S6B WiFi Module
and the XBee S1 802.14.4 module.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Abhishek Malik <abhishek.malik@intel.com>

src/xbee/xbee.cxx

@@ -0,0 +1,102 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2015 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <iostream>
+#include <time.h>
+
+#include "xbee.h"
+
+using namespace upm;
+using namespace std;
+
+static const int maxBuffer = 1024;
+
+XBee::XBee(int uart) :
+  m_uart(uart)
+{
+}
+
+XBee::~XBee()
+{
+}
+
+bool XBee::dataAvailable(unsigned int millis)
+{
+  return m_uart.dataAvailable(millis);
+}
+
+int XBee::readData(char *buffer, unsigned int len)
+{
+  return m_uart.read(buffer, len);
+}
+
+std::string XBee::readDataStr(int len)
+{
+  return m_uart.readStr(len);
+}
+
+int XBee::writeData(char *buffer, unsigned int len)
+{
+  m_uart.flush();
+  return m_uart.write(buffer, len);
+}
+
+int XBee::writeDataStr(std::string data)
+{
+  m_uart.flush();
+  return m_uart.writeStr(data);
+}
+
+mraa::Result XBee::setBaudRate(int baud)
+{
+  return m_uart.setBaudRate(baud);
+}
+
+bool XBee::commandMode(std::string cmdChars, int guardTimeMS)
+{
+
+  usleep(guardTimeMS * 1000);
+
+  writeDataStr(cmdChars);
+
+  usleep(guardTimeMS * 1000);
+
+  string resp;
+  if (dataAvailable(1000))
+    resp = readDataStr(maxBuffer);
+
+  if (resp.find("OK"))
+    return true;
+  else
+    return false;
+}
+
+string XBee::stringCR2LF(string str)
+{
+  for (int i=0; i<str.size(); i++)
+    if (str[i] == '\r')
+      str[i] = '\n';
+  
+  return str;
+}