samples: lorawan: Add Class-A LoRaWAN sample application

This sample application shows how to configure an end node in Class-A
mode and to send data to network server via gateway.

Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>

samples/lorawan/class_a/CMakeLists.txt

@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(lorawan)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

samples/lorawan/class_a/boards/96b_wistrio.conf

@@ -0,0 +1 @@
+CONFIG_SPI_1=y

samples/lorawan/class_a/prj.conf

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+CONFIG_LOG=y
+CONFIG_SPI=y
+CONFIG_GPIO=y
+CONFIG_LORA=y
+CONFIG_LORA_SX12XX=y
+CONFIG_LORAWAN=y
+CONFIG_LORAMAC_REGION_IN865=y

samples/lorawan/class_a/sample.yaml

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+common:
+   tags: lorawan
+sample:
+   description: Demonstration of Class-A LoRaWAN functionality
+   name: LoRaWAN Class-A
+tests:
+   samples.lorawan.class_a:
+     platform_allow: 96b_wistrio

samples/lorawan/class_a/src/main.c

@@ -0,0 +1,94 @@
+/*
+ * Class A LoRaWAN sample application
+ *
+ * Copyright (c) 2020 Manivannan Sadhasivam <mani@kernel.org>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <device.h>
+#include <lorawan/lorawan.h>
+#include <zephyr.h>
+
+#define DEFAULT_RADIO_NODE DT_ALIAS(lora0)
+BUILD_ASSERT(DT_NODE_HAS_STATUS(DEFAULT_RADIO_NODE, okay),
+	     "No default LoRa radio specified in DT");
+#define DEFAULT_RADIO DT_LABEL(DEFAULT_RADIO_NODE)
+
+/* Customize based on network configuration */
+#define LORAWAN_DEV_EUI			{ 0xDD, 0xEE, 0xAA, 0xDD, 0xBB, 0xEE,\
+					  0xEE, 0xFF }
+#define LORAWAN_JOIN_EUI		{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
+					  0x00, 0x00 }
+#define LORAWAN_APP_KEY			{ 0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE,\
+					  0xD2, 0xA6, 0xAB, 0xF7, 0x15, 0x88,\
+					  0x09, 0xCF, 0x4F, 0x3C }
+
+#define DELAY K_MSEC(10000)
+
+#define LOG_LEVEL CONFIG_LOG_DEFAULT_LEVEL
+#include <logging/log.h>
+LOG_MODULE_REGISTER(lorawan_class_a);
+
+char data[] = {'h', 'e', 'l', 'l', 'o', 'w', 'o', 'r', 'l', 'd'};
+
+void main(void)
+{
+	const struct device *lora_dev;
+	struct lorawan_join_config join_cfg;
+	uint8_t dev_eui[] = LORAWAN_DEV_EUI;
+	uint8_t join_eui[] = LORAWAN_JOIN_EUI;
+	uint8_t app_key[] = LORAWAN_APP_KEY;
+	int ret;
+
+	lora_dev = device_get_binding(DEFAULT_RADIO);
+	if (!lora_dev) {
+		LOG_ERR("%s Device not found", DEFAULT_RADIO);
+		return;
+	}
+
+	ret = lorawan_start();
+	if (ret < 0) {
+		LOG_ERR("lorawan_start failed: %d", ret);
+		return;
+	}
+
+	join_cfg.mode = LORAWAN_CLASS_A;
+	join_cfg.dev_eui = dev_eui;
+	join_cfg.otaa.join_eui = join_eui;
+	join_cfg.otaa.app_key = app_key;
+	join_cfg.otaa.nwk_key = app_key;
+
+	LOG_INF("Joining network over OTAA");
+	ret = lorawan_join(&join_cfg);
+	if (ret < 0) {
+		LOG_ERR("lorawan_join_network failed: %d", ret);
+		return;
+	}
+
+	LOG_INF("Sending data...");
+	while (1) {
+		ret = lorawan_send(2, data, sizeof(data),
+				   LORAWAN_MSG_CONFIRMED);
+
+		/*
+		 * Note: The stack may return -EAGAIN if the provided data
+		 * length exceeds the maximum possible one for the region and
+		 * datarate. But since we are just sending the same data here,
+		 * we'll just continue.
+		 */
+		if (ret == -EAGAIN) {
+			LOG_ERR("lorawan_send failed: %d. Continuing...", ret);
+			k_sleep(DELAY);
+			continue;
+		}
+
+		if (ret < 0) {
+			LOG_ERR("lorawan_send failed: %d", ret);
+			return;
+		}
+
+		LOG_INF("Data sent!");
+		k_sleep(DELAY);
+	}
+}