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/python/rn2903-p2p-rx.py

@@ -0,0 +1,108 @@
+#!/usr/bin/python
+# Author: Jon Trulson <jtrulson@ics.com>
+# Copyright (c) 2017 Intel Corporation.
+#
+# The MIT License
+#
+# 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.
+
+from __future__ import print_function
+import time, sys, signal, atexit
+from upm import pyupm_rn2903 as sensorObj
+
+def main():
+    ## Exit handlers ##
+    # This function stops python from printing a stacktrace when you
+    # hit control-C
+    def SIGINTHandler(signum, frame):
+        raise SystemExit
+
+    # This function lets you run code on exit
+    def exitHandler():
+        print("Exiting")
+        sys.exit(0)
+
+    # Register exit handlers
+    atexit.register(exitHandler)
+    signal.signal(signal.SIGINT, SIGINTHandler)
+
+    defaultDev = "/dev/ttyUSB0"
+    if (len(sys.argv) > 1):
+        defaultDev = sys.argv[1]
+    print("Using device", defaultDev)
+
+    # Instantiate a RN2903 sensor on defaultDev at 57600 baud.
+    sensor = 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.
+    #
+    # sensor = sensorObj.RN2903(0,
+    #                           sensorObj.RN2903_DEFAULT_BAUDRATE)
+
+    # enable debugging
+    # sensor.setDebug(True)
+
+    # get version
+    if (sensor.command("sys get ver")):
+        print("Failed to retrieve device version string")
+        sys.exit(1)
+
+    print("Firmware version: " + sensor.getResponse())
+
+    print("Hardware EUI: " + sensor.getHardwareEUI())
+
+    # For this example, we will just try to receive a packet
+    # transmitted by the p2p-tx rn2903 example.  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();
+
+    # We will use continuous mode (window_size 0), though the default
+    # radio watch dog timer will expire every 15 seconds.  We will
+    # just loop here.
+
+    while (True):
+        print("Waiting for packet...")
+        rv = sensor.radioRx(0);
+        if (rv):
+            print("radioRx() failed with code " + str(rv))
+        else:
+            resp = sensor.getResponse();
+            payload = sensor.getRadioRxPayload();
+            if (not len(payload)):
+                print("Got response: '", end='')
+                print(resp, end="")
+                print("'")
+            else:
+                print("Got payload: '", end='')
+                print(sensor.fromHex(payload), end='')
+                print("'")
+
+        print()
+
+
+if __name__ == '__main__':
+    main()