feat: add initial libcoap

recipes/libcoap/all/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.1)
+project(cmake_wrapper)
+
+include(conanbuildinfo.cmake)
+conan_basic_setup()
+
+add_subdirectory(source_subfolder)

recipes/libcoap/all/conandata.yml

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+sources:
+  "cci.20200424":
+    sha256: 8402bf2dd9979d6d5f823a050cd3533619fe9b21e76be8c69a9b7d8b8ea175ab
+    url: https://github.com/obgm/libcoap/archive/17957e1e687c2218b7752a8a959eac36dbf5cb62.zip

recipes/libcoap/all/conanfile.py

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+import os
+from conans import CMake, ConanFile, tools
+from conans.errors import ConanInvalidConfiguration
+
+
+class LibCoapConan(ConanFile):
+    name = "libcoap"
+    license = "BSD-2-Clause"
+    homepage = "https://github.com/obgm/libcoap"
+    url = "https://github.com/conan-io/conan-center-index"
+    description = """A CoAP (RFC 7252) implementation in C"""
+    topics = ("coap")
+    exports_sources = "CMakeLists.txt"
+    settings = "os", "compiler", "build_type", "arch"
+    options = {
+        "shared": [True, False],
+        "fPIC": [True, False],
+        "with_epoll": [True, False],
+        "dtls_backend": [None, "openssl", "gnutls", "tinydtls", "mbedtls"],
+    }
+    default_options = {
+        "shared": False,
+        "fPIC": True,
+        "with_epoll": False,
+        "dtls_backend": "openssl",
+    }
+    generators = "cmake", "cmake_find_package"
+
+    _cmake = None
+
+    @property
+    def _source_subfolder(self):
+        return "source_subfolder"
+
+    @property
+    def _build_subfolder(self):
+        return "build_subfolder"
+
+    def requirements(self):
+        if self.options.dtls_backend == "openssl":
+            self.requires("openssl/1.1.1g")
+        elif self.options.dtls_backend == "mbedtls":
+            self.requires("mbedtls/2.16.3-apache")
+        elif self.options.dtls_backend == "gnutls":
+            raise ConanInvalidConfiguration("gnu tls not available yet")
+        elif self.options.dtls_backend == "tinydtls":
+            raise ConanInvalidConfiguration("tinydtls not available yet")
+
+    def config_options(self):
+        if self.settings.os == "Windows":
+            del self.options.fPIC
+
+    def configure(self):
+        if self.settings.os in ("Windows", "Macos"):
+            raise ConanInvalidConfiguration("Platform is currently not supported")
+        if self.options.shared:
+            del self.options.fPIC
+        del self.settings.compiler.libcxx
+        del self.settings.compiler.cppstd
+
+    def source(self):
+        tools.get(**self.conan_data["sources"][self.version])
+        extracted_dir = self.name + "-" + \
+            os.path.basename(
+                self.conan_data["sources"][self.version]["url"]).split(".")[0]
+        os.rename(extracted_dir, self._source_subfolder)
+
+    def _configure_cmake(self):
+        if self._cmake:
+            return self._cmake
+        self._cmake = CMake(self)
+        self._cmake.definitions["WITH_EPOLL"] = self.options.with_epoll
+        self._cmake.definitions["ENABLE_DTLS"] = self.options.dtls_backend != None
+        self._cmake.definitions["DTLS_BACKEND"] = self.options.dtls_backend
+        self._cmake.configure(build_folder=self._build_subfolder)
+        return self._cmake
+
+    def build(self):
+        cmake = self._configure_cmake()
+        cmake.build()
+
+    def package(self):
+        self.copy("LICENSE", src=self._source_subfolder, dst="licenses")
+        cmake = self._configure_cmake()
+        cmake.install()
+        tools.rmdir(os.path.join(self.package_folder, "lib", "cmake"))
+
+    def package_info(self):
+        pkgconfig_filename = "libcoap-2{}".format("-{}".format(self.options.dtls_backend) if self.options.dtls_backend else "")
+        self.cpp_info.names["pkg_config"] = pkgconfig_filename 
+        self.cpp_info.components["coap"].names["cmake_find_package"] = "coap"
+        self.cpp_info.components["coap"].names["cmake_find_package_multi"] = "coap"
+        self.cpp_info.components["coap"].names["pkg_config"] = pkgconfig_filename
+        self.cpp_info.components["coap"].libs = ["coap"]
+        if self.settings.os == "Linux":
+            self.cpp_info.components["coap"].system_libs = ["pthread"]

recipes/libcoap/all/test_package/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.1)
+project(test_package)
+
+include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
+conan_basic_setup()
+
+find_package(libcoap REQUIRED CONFIG)
+
+add_executable(${PROJECT_NAME} test_package.cpp)
+target_link_libraries(${PROJECT_NAME} libcoap::coap)
+set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11)

recipes/libcoap/all/test_package/conanfile.py

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+import os
+from conans import ConanFile, CMake, tools
+
+
+class TestConan(ConanFile):
+    settings = "os", "compiler", "build_type", "arch"
+    generators = "cmake", "cmake_find_package_multi"
+
+    def build(self):
+        cmake = CMake(self)
+        cmake.configure()
+        cmake.build()
+
+    def test(self):
+        if not tools.cross_building(self.settings):
+            bin_path = os.path.join("bin", "test_package")
+            bin_path = self.run(bin_path, run_environment=True)

recipes/libcoap/all/test_package/test_package.cpp

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+#include "coap2/coap.h"
+#include <iostream>
+
+int main() {
+  std::cout << "starting" << std::endl;
+  coap_startup();
+
+  // create CoAP context and a client session
+  coap_context_t *ctx = coap_new_context(nullptr);
+
+  coap_free_context(ctx);
+  coap_cleanup();
+  std::cout << "stopping" << std::endl;
+  return 0;
+}

recipes/libcoap/config.yml

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+---
+versions:
+  "cci.20200424":
+    folder: "all"