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/javascript/rn2903-p2p-tx.js

@@ -0,0 +1,108 @@
+/*
+ * 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.
+ */
+
+var sensorObj = require('jsupm_rn2903');
+
+var defaultDev = "/dev/ttyUSB0";
+
+// if an argument was specified, use it as the device instead
+if (process.argv.length > 2)
+{
+    defaultDev = process.argv[2];
+}
+
+console.log("Using device:", defaultDev);
+
+// Instantiate a RN2903 sensor on defaultDev at 57600 baud.
+var sensor = new sensorObj.RN2903(defaultDev,
+                                  sensorObj.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.
+//
+// var sensor = new sensorObj.RN2903(0,
+//                                   sensorObj.RN2903_DEFAULT_BAUDRATE);
+
+// enable debugging
+// sensor.setDebug(true);
+
+// get version
+if (sensor.command("sys get ver"))
+{
+    console.log("Failed to retrieve device version string");
+    process.exit(1);
+}
+console.log("Firmware version: " + sensor.getResponse());
+
+console.log("Hardware EUI: " + sensor.getHardwareEUI());
+
+// 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.
+
+var count = 0;
+function transmit()
+{
+    var output = "Ping " + count;
+    count++;
+
+    // All payloads must be hex encoded
+    var payload = sensor.toHex(output);
+
+    console.log("Transmitting a packet, data: '"
+                + output
+                + "' -> hex: '"
+                + payload
+                + "'");
+
+    var rv = sensor.radioTx(payload);
+
+    if (rv == sensorObj.RN2903_RESPONSE_OK)
+        console.log("Transmit successful.");
+    else
+        console.log("Transmit failed with code " + rv);
+
+    console.log();
+}
+
+setInterval(transmit, 10000);
+
+process.on('SIGINT', function() {
+    sensor = null;
+    sensorObj.cleanUp();
+    sensorObj = null;
+    console.log("Exiting...");
+    process.exit(0);
+});