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.c

@@ -0,0 +1,139 @@
+/*
+ * 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 <stdio.h>
+#include <string.h>
+#include <signal.h>
+
+#include "rn2903.h"
+#include "upm_utilities.h"
+#include "upm_platform.h"
+
+bool shouldRun = true;
+
+void sig_handler(int signo)
+{
+    if (signo == SIGINT)
+        shouldRun = false;
+}
+
+#if defined(UPM_PLATFORM_ZEPHYR) && !defined(CONFIG_STDOUT_CONSOLE)
+# define printf printk
+#endif
+
+int main(int argc, char **argv)
+{
+//! [Interesting]
+
+    char *defaultDev = "/dev/ttyUSB0";
+    if (argc > 1)
+        defaultDev = argv[1];
+
+    printf("Using device: %s\n", defaultDev);
+
+    // Instantiate a RN2903 sensor on defaultDev at 57600 baud.
+#if defined(UPM_PLATFORM_ZEPHYR)
+    rn2903_context sensor = rn2903_init(0, RN2903_DEFAULT_BAUDRATE);
+#else
+    rn2903_context sensor = rn2903_init_tty(defaultDev,
+                                            RN2903_DEFAULT_BAUDRATE);
+#endif
+
+    // To use an internal UART understood by MRAA, use the following
+    // to inititialize rather than the above, which by default uses a
+    // tty path.
+    //
+    // rn2903_context sensor = rn2903_init(0, RN2903_DEFAULT_BAUDRATE);
+
+    if (!sensor)
+    {
+        printf("rn2903_init_tty() failed.\n");
+        return 1;
+    }
+
+    // enable debugging
+    // rn2903_set_debug(sensor, true);
+
+    // get version
+    if (rn2903_command(sensor, "sys get ver"))
+    {
+        printf("Failed to retrieve device version string\n");
+        rn2903_close(sensor);
+        return 1;
+    }
+    printf("Firmware version: %s\n", rn2903_get_response(sensor));
+
+    printf("Hardware EUI: %s\n", rn2903_get_hardware_eui(sensor));
+
+    // 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.
+    if (rn2903_mac_pause(sensor))
+    {
+        printf("Failed to pause the LoRaWAN stack\n");
+        rn2903_close(sensor);
+        return 1;
+    }
+
+    // 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)
+    {
+        char pingbuf[32] = {};
+        snprintf(pingbuf, 32, "Ping %d", count++);
+        // All payloads must be hex encoded
+        const char *payload = rn2903_to_hex(sensor, pingbuf, strlen(pingbuf));
+
+        printf("Transmitting a packet, data: '%s' -> hex: '%s'\n",
+               pingbuf, payload);
+
+        RN2903_RESPONSE_T rv;
+        rv = rn2903_radio_tx(sensor, payload);
+
+        if (rv == RN2903_RESPONSE_OK)
+            printf("Transmit successful.\n");
+        else
+            printf("Transmit failed with code %d.\n", rv);
+
+        printf("\n");
+        upm_delay(10);
+    }
+
+    printf("Exiting\n");
+
+    rn2903_close(sensor);
+
+//! [Interesting]
+
+    return 0;
+}