Make README.md a bit more informative

Makefile

@@ -0,0 +1,17 @@
+CC = clang
+CFLAGS_GEOCLUE = -I/usr/include/libgeoclue-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/sysprof-6 -pthread
+CFLAGS = -Wall -Wextra -g $(CFLAGS_GEOCLUE) -ljson-c -lcurl -lgeoclue-2 -lglib-2.0 -lgobject-2.0
+SRCS = src/main.c
+
+phonetrackd := phonetrackd
+
+$(phonetrackd): $(SRCS)
+	$(CC) $(CFLAGS) $(SRCS) -o $(phonetrackd)
+
+all: $(phonetrackd)
+
+install: $(phonetrackd)
+	cp $(phonetrackd) /usr/local/bin/
+
+clean:
+	rm $(phonetrackd)

README.md

@@ -1,2 +1,4 @@
 # phonetrack-linux
 
+Basically a position logger/reporter but for Linux devices.
+This is still a work in progress aiming to have feature parity with the PhoneTrack Android app.

src/main.c

@@ -0,0 +1,104 @@
+#include <json-c/json.h>
+#include <curl/curl.h>
+#include <geoclue.h>
+
+GClueSimple *geoclue_simple = NULL;
+GClueClient *geoclue_client = NULL;
+GMainLoop *main_loop;
+
+gboolean on_location_timeout(gpointer user_data) {
+	(void) user_data;
+
+	g_clear_object(&geoclue_client);
+	g_clear_object(&geoclue_simple);
+	g_main_loop_quit(main_loop);
+
+	return FALSE;
+}
+
+void get_location(GClueSimple *simple) {
+	(void) simple;
+
+	GClueLocation *location;
+	gdouble latitude, longitude, altitude, accuracy;
+	GVariant *timestamp;
+	// const char *description;
+
+	location = gclue_simple_get_location(simple);
+	json_object *location_json = json_object_new_object();
+
+	latitude = gclue_location_get_latitude(location);
+	longitude = gclue_location_get_longitude(location);
+	altitude = gclue_location_get_altitude(location);
+	accuracy = gclue_location_get_accuracy(location);
+
+	json_object *latitude_json = json_object_new_double(latitude);
+	json_object_object_add(location_json, "lat", latitude_json);
+	json_object *longitude_json = json_object_new_double(longitude);
+	json_object_object_add(location_json, "lon", longitude_json);
+	json_object *altitude_json = json_object_new_double(altitude);
+	json_object_object_add(location_json, "alt", altitude_json);
+	json_object *accuracy_json = json_object_new_double(accuracy);
+	json_object_object_add(location_json, "acc", accuracy_json);
+	timestamp = gclue_location_get_timestamp(location);
+	if (timestamp) {
+		unsigned long timestamp_sec, timestamp_usec;
+		g_variant_get(timestamp, "(tt)", &timestamp_sec, &timestamp_usec);
+
+		json_object *timestamp_json = json_object_new_int(timestamp_sec);
+		json_object_object_add(location_json, "tst", timestamp_json);
+	}
+
+	const char *location_payload = json_object_to_json_string(location_json);
+	printf("%s\n", location_payload);
+}
+
+void on_geoclue_client_active(GClueClient *geoclue_client, GParamSpec *parameter_spec, gpointer user_data) {
+	(void) parameter_spec;
+	(void) user_data;
+
+	if (gclue_client_get_active(geoclue_client))
+		return;
+
+	printf("Geolocation disabled, can't continue... \n");
+	on_location_timeout(NULL);
+}
+
+void on_geoclue_ready(GObject *source_object, GAsyncResult *result, gpointer user_data) {
+	(void) source_object;
+	(void) user_data;
+
+	GError *error = NULL;
+
+	geoclue_simple = gclue_simple_new_with_thresholds_finish(result, &error);
+	if (error != NULL) {
+		printf("Couldn't connect to the GeoClue service : %s\n", error->message);
+
+		exit(-1);
+	}
+
+	geoclue_client = gclue_simple_get_client(geoclue_simple);
+	if (geoclue_client) {
+		g_object_ref(geoclue_client);
+		printf("GeoClue client ready ! \n");
+
+		g_signal_connect(geoclue_client, "notify::active", G_CALLBACK(on_geoclue_client_active), NULL);
+	}
+
+	get_location(geoclue_simple);
+
+	g_signal_connect(geoclue_client, "notify::location", G_CALLBACK(get_location), NULL);
+
+}
+
+int main(int argc, const char *argv[]) {
+	(void) argc;
+	(void) argv;
+
+	gclue_simple_new("phonetrackd", GCLUE_ACCURACY_LEVEL_EXACT, NULL, on_geoclue_ready, NULL);
+
+	main_loop = g_main_loop_new(NULL, FALSE);
+	g_main_loop_run(main_loop);
+
+	return 0;
+}