read and parse Key Export, started WiFi and CWA connection

components/ena-cwa/include/ena-cwa.h

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+// Copyright 2020 Lukas Haubaum
+//
+// Licensed under the GNU Affero General Public License, Version 3;
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     https://www.gnu.org/licenses/agpl-3.0.html
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#ifndef _ena_CWA_H_
+#define _ena_CWA_H_
+
+#define ENA_CWA_LOG "ESP-ENA-corona-warn-app" // TAG for Logging
+
+#define ENA_CWA_KEYFILES_URL "http://svc90.main.px.t-online.de/version/v1/diagnosis-keys/country/DE/date/%s"
+
+/**
+ * @brief fetch key export for given date
+ * 
+ * @param[in] date_string the date to fetch the data for
+ */
+void ena_cwa_receive_keys(char *date_string);
+
+#endif