rn2903: Initial implementation; C; C++ wraps C; examples

This requires a new MRAA with UART sendbreak support.

Signed-off-by: Jon Trulson <jtrulson@ics.com>

examples/c++/rn2903-p2p-tx.cxx

@@ -0,0 +1,126 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2017 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 <unistd.h>
+#include <iostream>
+#include <sstream>
+#include <string>
+#include <signal.h>
+
+#include "rn2903.hpp"
+#include "upm_utilities.h"
+
+using namespace std;
+
+bool shouldRun = true;
+
+void sig_handler(int signo)
+{
+  if (signo == SIGINT)
+    shouldRun = false;
+}
+
+
+int main(int argc, char **argv)
+{
+  signal(SIGINT, sig_handler);
+//! [Interesting]
+
+    string defaultDev = "/dev/ttyUSB0";
+    if (argc > 1)
+        defaultDev = argv[1];
+
+    cout << "Using device: " << defaultDev << endl;
+
+    // Instantiate a RN2903 sensor on defaultDev at 57600 baud.
+    upm::RN2903 sensor = upm::RN2903(defaultDev,
+                                     RN2903_DEFAULT_BAUDRATE);
+
+    // To use an internal UART understood by MRAA, use the following
+    // to inititialize rather than the above, which by default uses a
+    // tty path.
+    //
+    // upm::RN2903 sensor = upm::RN2903(0, RN2903_DEFAULT_BAUDRATE);
+
+    // enable debugging
+    // sensor.setDebug(true);
+
+    // get version
+    if (sensor.command("sys get ver"))
+    {
+        cout << "Failed to retrieve device version string" << endl;
+        return 1;
+    }
+    cout << "Firmware version: " << sensor.getResponse() << endl;
+
+    cout << "Hardware EUI: " << sensor.getHardwareEUI() << endl;
+
+    // For this example, we will just try transmitting a packet over
+    // LoRa.  We reset the device to defaults, and we do not make any
+    // adjustments to the radio configuration.  You will probably want
+    // to do so for a real life application.
+
+    // The first thing to do is to suspend the LoRaWAN stack on the device.
+    sensor.macPause();
+
+    // the default radio watchdog timer is set for 15 seconds, so we
+    // will send a packet every 10 seconds.  In reality, local
+    // restrictions limit the amount of time on the air, so in a real
+    // implementation, you would not want to send packets that
+    // frequently.
+
+    int count = 0;
+    while (shouldRun)
+    {
+        ostringstream output;
+        output << "Ping " << count++;
+
+        // All payloads must be hex encoded
+        string payload = sensor.toHex(output.str());
+
+        cout << "Transmitting a packet, data: '"
+             << output.str()
+             << "' -> hex: '"
+             << payload
+             << "'"
+             << endl;
+
+        RN2903_RESPONSE_T rv;
+        rv = sensor.radioTx(payload);
+
+        if (rv == RN2903_RESPONSE_OK)
+            cout << "Transmit successful." << endl;
+        else
+            cout << "Transmit failed with code " << int(rv) << endl;
+
+        cout << endl;
+        upm_delay(10);
+    }
+
+    cout << "Exiting" << endl;
+
+//! [Interesting]
+
+    return 0;
+}