Add provisioning task, refactor provisioning

src/provisioning.h

@@ -0,0 +1,35 @@
+/*******************************************************************************
+ * 
+ * ttn-esp32 - The Things Network device library for ESP-IDF / SX127x
+ * 
+ * Copyright (c) 2018 Manuel Bleichenbacher
+ * 
+ * Licensed under MIT License
+ * https://opensource.org/licenses/MIT
+ *
+ * Task listening on a UART port for provisioning commands.
+ *******************************************************************************/
+
+#ifndef _provision_task_h_
+#define _provision_task_h_
+
+#include "oslmic.h"
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+void provisioning_start_task();
+bool provisioning_have_keys();
+bool provisioning_decode_keys(const char *dev_eui, const char *app_eui, const char *app_key);
+bool provisioning_save_keys();
+bool provisioning_restore_keys(bool silent);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif