NOISSUE - Add MQTTS zephyrs target.

targets/zephyr_targets/mqtts/.gitignore

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+build
+Kconfig
+src/creds

targets/zephyr_targets/mqtts/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20.0)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(mqtts)
+
+if(USE_DUMMY_CREDS)
+  set(creds "src/creds/dummy.c")
+else()
+  if(NOT EXISTS ${APPLICATION_SOURCE_DIR}/src/creds/key.c OR
+     NOT EXISTS ${APPLICATION_SOURCE_DIR}/src/creds/cert.c OR
+     NOT EXISTS ${APPLICATION_SOURCE_DIR}/src/creds/ca.c)
+    message(FATAL_ERROR
+        "Credentials not found. Please run "
+        "'python3 src/creds/convert_keys.py' before building"
+    )
+  endif()
+
+  set(creds "src/creds/ca.c" "src/creds/key.c" "src/creds/cert.c")
+endif()
+
+target_sources(app PRIVATE "src/main.c" ${creds})
+target_sources_ifdef(CONFIG_NET_DHCPV4 app PRIVATE "src/dhcp.c")

targets/zephyr_targets/mqtts/README.md

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+MQTTS- stm32f4 target
+## Requirements
+1. Mainflux broker details including: hostname, ThingID, Thing Credentials and Channel ID
+2. [Zephyr](https://www.zephyrproject.org/)
+
+
+## Configure
+1. Edit the [config file](include/config.h) with your broker details.
+
+## Build
+The project can be built by utilising the make file within the target directory
+
+```bash
+west build -p always -b <your-board-name> mqtt
+```
+## Flash
+Platform io generate a build directory with the fimware.bin within it. Use the make command to flash to board
+```bash
+west flash
+```

targets/zephyr_targets/mqtts/prj.conf

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+CONFIG_MAIN_STACK_SIZE=4096
+CONFIG_ENTROPY_GENERATOR=y
+CONFIG_TEST_RANDOM_GENERATOR=y
+CONFIG_INIT_STACKS=y
+CONFIG_HW_STACK_PROTECTION=y
+CONFIG_NEWLIB_LIBC=y
+CONFIG_SNTP=y
+CONFIG_JSON_LIBRARY=y
+CONFIG_POSIX_CLOCK=y
+
+# DNS
+CONFIG_DNS_RESOLVER=y
+CONFIG_DNS_RESOLVER_ADDITIONAL_BUF_CTR=2
+CONFIG_DNS_RESOLVER_MAX_SERVERS=1
+CONFIG_DNS_SERVER_IP_ADDRESSES=y
+CONFIG_DNS_SERVER1="8.8.8.8"
+CONFIG_NET_SOCKETS_DNS_TIMEOUT=5000
+CONFIG_DNS_RESOLVER_LOG_LEVEL_DBG=n
+
+# Generic networking options
+CONFIG_NETWORKING=y
+CONFIG_NET_UDP=y
+CONFIG_NET_TCP=y
+CONFIG_NET_IPV6=y
+CONFIG_NET_IPV4=y
+CONFIG_NET_SOCKETS=y
+CONFIG_NET_SOCKETS_SOCKOPT_TLS=y
+
+# Logging
+CONFIG_LOG=y
+
+# Network buffers
+CONFIG_NET_PKT_RX_COUNT=32
+CONFIG_NET_PKT_TX_COUNT=16
+CONFIG_NET_BUF_RX_COUNT=64
+CONFIG_NET_BUF_TX_COUNT=32
+
+# MQTT
+CONFIG_MQTT_LIB=y
+CONFIG_MQTT_LIB_TLS=y
+CONFIG_MQTT_KEEPALIVE=60
+
+# TLS
+CONFIG_MBEDTLS=y
+CONFIG_MBEDTLS_BUILTIN=y
+CONFIG_MBEDTLS_ENABLE_HEAP=y
+CONFIG_MBEDTLS_HEAP_SIZE=65536
+CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=16384
+CONFIG_MBEDTLS_PEM_CERTIFICATE_FORMAT=y
+CONFIG_MBEDTLS_SERVER_NAME_INDICATION=y
+CONFIG_MBEDTLS_AES_ROM_TABLES=y
+CONFIG_MBEDTLS_TLS_VERSION_1_2=y
+CONFIG_MBEDTLS_MEMORY_DEBUG=y
+CONFIG_MBEDTLS_HAVE_TIME_DATE=y

targets/zephyr_targets/mqtts/src/config.h

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+#ifndef CONFIG_H
+#define CONFIG_H
+
+#define MQTT_CLIENTID ""
+#define SNTP_SERVER "0.pool.ntp.org
+#define BROKER ""
+#define BROKER_PORT "8883"
+#define MQTT_BUFFER_SIZE 256u
+#define APP_BUFFER_SIZE 4096u
+#define MAX_RETRIES 10u
+#define BACKOFF_EXP_BASE_MS 1000u
+#define BACKOFF_EXP_MAX_MS 60000u
+#define BACKOFF_CONST_MS 5000u
+#define KEEP_ALIVE 60
+
+const char *mfThingId = " ";
+const char *mfThingKey = " ";
+const char *mfChannelId = " ";
+char mfTopic[150];
+
+const char *brokername = ""
+
+#endif

targets/zephyr_targets/mqtts/src/dhcp.c

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+#include <zephyr/logging/log.h>
+
+LOG_MODULE_DECLARE(aws, LOG_LEVEL_DBG);
+
+#include <zephyr/kernel.h>
+
+#include <zephyr/net/net_if.h>
+#include <zephyr/net/net_core.h>
+#include <zephyr/net/net_context.h>
+#include <zephyr/net/net_mgmt.h>
+
+static struct net_mgmt_event_callback mgmt_cb;
+
+static K_SEM_DEFINE(got_address, 0, 1);
+
+static void handler(struct net_mgmt_event_callback *cb,
+		    uint32_t mgmt_event,
+		    struct net_if *iface)
+{
+	int i;
+	bool notified = false;
+
+	if (mgmt_event != NET_EVENT_IPV4_ADDR_ADD) {
+		return;
+	}
+
+	for (i = 0; i < NET_IF_MAX_IPV4_ADDR; i++) {
+		if (iface->config.ip.ipv4->unicast[i].addr_type !=
+		    NET_ADDR_DHCP) {
+			continue;
+		}
+
+		if (!notified) {
+			k_sem_give(&got_address);
+			notified = true;
+		}
+		break;
+	}
+}
+
+void app_dhcpv4_startup(void)
+{
+	LOG_INF("starting DHCPv4");
+
+	net_mgmt_init_event_callback(&mgmt_cb, handler,
+				     NET_EVENT_IPV4_ADDR_ADD);
+	net_mgmt_add_event_callback(&mgmt_cb);
+
+	net_dhcpv4_start(net_if_get_default());
+
+	k_sem_take(&got_address, K_FOREVER);
+}

targets/zephyr_targets/mqtts/src/dhcp.h

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+#ifndef __DHCP_H__
+#define __DHCP_H__
+
+void app_dhcpv4_startup(void);
+
+#endif