Merge branch '31-Net-Protocol-Handling'

Signed-off-by: Gediminas Jakutis <gediminas@varciai.lt>

1 files changed, 103 insertions, 0 deletions

diff --git a/src/device/device_network.cpp b/src/device/device_network.cpp
new file mode 100644
index 0000000..d7781a0
--- /dev/null
+++ b/src/device/device_network.cpp
@@ -0,0 +1,103 @@
+/*
+ * Usurpation – wearable device udp packet handling
+ *
+ * Copyright (C) 2019 Gediminas Jakutis
+ * Copyright (C) 2019 Ramūnas Mažeikis
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; version 2.1
+ * of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include <ESP8266WiFi.h>
+#include <WiFiUdp.h>
+#include "device_network.h"
+#include "net.h"
+
+static struct netstate {
+	WiFiUDP udp;
+	char udppacketbuffer[1500];
+	char *udppacketcursor;
+	IPAddress daemon_ip;
+	bool acquired;
+} state;
+
+
+static void udp_init_packet_expaddr(IPAddress ip, const int port);
+
+void udp_init(const int port)
+{
+	state.udp.begin(com_port);
+}
+
+void udp_init_packet(const int port)
+{
+	state.udp.beginPacket(state.daemon_ip, port);
+	memset(state.udppacketbuffer, 0, sizeof(state.udppacketbuffer));
+	state.udppacketcursor = state.udppacketbuffer;
+}
+
+void udp_push(const void * const data, const size_t size)
+{
+	memcpy(state.udppacketcursor, data, size);
+	state.udppacketcursor += size;
+}
+
+int udp_flush(void)
+{
+	state.udp.write((const uint8_t *) state.udppacketbuffer, state.udppacketcursor - state.udppacketbuffer);
+	return state.udp.endPacket();
+}
+
+void discover_client(const int port)
+{
+	IPAddress bcastip(255, 255, 255, 255);
+	char buffer[32] = {0};
+
+	do {
+		udp_init_packet_expaddr(bcastip, port);
+		udp_push(servermagic, sizeof(servermagic));
+		udp_flush();
+		delay(5);
+		while (state.udp.parsePacket()) {
+			if (state.udp.available() >= sizeof(clientmagic)) {
+				state.udp.read(buffer, sizeof(clientmagic));
+				if (!(strcmp(clientmagic, buffer))) {
+					state.daemon_ip = state.udp.remoteIP();
+					++state.acquired;
+				}
+			}
+		}
+		delay(95);
+	} while (!state.acquired);
+}
+
+IPAddress *get_daemon_address(void)
+{
+	IPAddress *ret;
+	if (!state.acquired) {
+		ret = new IPAddress(0, 0, 0, 0);
+	} else {
+		ret = new IPAddress(state.daemon_ip);
+	}
+
+	return ret;
+}
+
+static void udp_init_packet_expaddr(IPAddress ip, const int port)
+{
+	state.udp.beginPacket(ip, port);
+	memset(state.udppacketbuffer, 0, sizeof(state.udppacketbuffer));
+	state.udppacketcursor = state.udppacketbuffer;
+}
+