tests: add test application for Cayenne LPP package

tests/pkg_cayenne-lpp/Makefile

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+include ../Makefile.tests_common
+
+USEPKG += cayenne-lpp
+
+include $(RIOTBASE)/Makefile.include
+
+test:
+	tests/01-run.py

tests/pkg_cayenne-lpp/README.md

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+Cayenne LPP test
+================
+
+Usage
+-----
+
+Simply run the application on native using:
+
+    make all term
+
+Expected result
+---------------
+
+The application should display the following output:
+
+    Cayenne LPP test application
+    03670110056700FF

tests/pkg_cayenne-lpp/main.c

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+/*
+ * Copyright (C) 2018 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     test
+ * @{
+ *
+ * @file
+ * @brief       Cayenne Low Power Payload example application
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+
+#include "cayenne-lpp.h"
+
+static cayenne_lpp_t lpp;
+
+static void _print_buffer(cayenne_lpp_t *lpp)
+{
+    for (uint8_t i = 0; i < lpp->cursor; ++i) {
+        printf("%02X", lpp->buffer[i]);
+    }
+    puts("");
+}
+
+int main(void)
+{
+    puts("Cayenne LPP test application");
+
+    /* generate payload like the one given as example at
+     * https://mydevices.com/cayenne/docs_stage/lora/#lora-cayenne-low-power-payload
+     */
+    /* Device with 2 temperature sensors */
+    cayenne_lpp_add_temperature(&lpp, 3, 27.2);
+    cayenne_lpp_add_temperature(&lpp, 5, 25.5);
+    _print_buffer(&lpp);
+
+    /* Device with temperature and acceleration sensors */
+    cayenne_lpp_reset(&lpp);
+    cayenne_lpp_add_temperature(&lpp, 1, -4.1);
+    cayenne_lpp_add_accelerometer(&lpp, 6, 1.234, -1.234, 0);
+    _print_buffer(&lpp);
+
+    /* Device with GPS */
+    cayenne_lpp_reset(&lpp);
+    cayenne_lpp_add_gps(&lpp, 1, 42.3519, -87.9094, 10);
+    _print_buffer(&lpp);
+
+    return 0;
+}

tests/pkg_cayenne-lpp/tests/01-run.py

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+#!/usr/bin/env python3
+
+import os
+import sys
+
+
+def testfunc(child):
+    child.expect_exact('03670110056700FF')
+    child.expect_exact('0167FFD8067104D1FB2F0000')
+    child.expect_exact('018806765EF2960A0003E8')
+
+
+if __name__ == "__main__":
+    sys.path.append(os.path.join(os.environ['RIOTBASE'], 'dist/tools/testrunner'))
+    from testrunner import run
+    sys.exit(run(testfunc))