Merge pull request #11 from felixgateru/esp32_coap_zephyr

NOISSUE -  Add zephyr target with CoAP capability

targets/zephyr_targets/coap/CMakeLists.txt

@@ -0,0 +1,7 @@
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(coap_client)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})
+target_include_directories(app PRIVATE ${ZEPHYR_BASE}/subsys/net/ip)

targets/zephyr_targets/coap/README.md

@@ -0,0 +1,20 @@
+MQTTS- esp32 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/coap/prj.conf

@@ -0,0 +1,29 @@
+# Generic networking options
+CONFIG_NETWORKING=y
+CONFIG_NEWLIB_LIBC=y
+CONFIG_NET_IPV6=y
+CONFIG_NET_UDP=y
+
+CONFIG_NET_SOCKETS=y
+CONFIG_NET_SOCKETS_POSIX_NAMES=y
+CONFIG_NET_SOCKETS_POLL_MAX=4
+
+CONFIG_COAP=y
+
+# Kernel options
+CONFIG_ENTROPY_GENERATOR=y
+CONFIG_TEST_RANDOM_GENERATOR=y
+
+# Logging
+CONFIG_PRINTK=y
+CONFIG_NET_LOG=y
+
+# Network Shell
+CONFIG_NET_SHELL=y
+
+CONFIG_NET_CONFIG_SETTINGS=y
+CONFIG_NET_CONFIG_NEED_IPV6=y
+CONFIG_NET_CONFIG_MY_IPV6_ADDR="2001:db8::2"
+CONFIG_NET_CONFIG_PEER_IPV6_ADDR="2001:db8::1"
+
+CONFIG_HEAP_MEM_POOL_SIZE=2048