Protocol: changes to interface and some re-implementation.

Most functions exposed in protocol.h take a connection descriptor
(cd_t) as first argument. This allows for multiple connections. Device
gets only one connection which means that cd_t is effectively 0 all
the time.

Additionaly, any function that actually does anything with a
connection descriptor instead of just passing it to another function
must be implemented separately in device and daemon.

Signed-off-by: Ramūnas Mažeikis <ramunasnezinomas@gmail.com>

2 files changed, 75 insertions, 0 deletions

diff --git a/src/device/protocol_device.ino b/src/device/protocol_device.ino
new file mode 100755
index 0000000..778196d
--- /dev/null
+++ b/src/device/protocol_device.ino
@@ -0,0 +1,38 @@
+#include "protocol.h"
+#include "protocol_private.h"
+#include "protocol_device_private.h"
+#include <ESP8266WiFi.h>
+#include <time.h>
+#include <stdlib.h>
+
+static struct connection_t connection;
+
+static int push_bytes(cd_t cd, char *data, size_t size)
+{
+        int ret = 0;
+
+        if (cd >= MAX_CONNECTIONS) {
+                ret = E_IVALID_DESCRIPTOR;
+        } else if (connection.outp_crs + size >= sizeof(connection.outp_buf)) {
+                ret = E_PACKET_OVERFLOW;
+        } else {
+
+        }
+        return ret;
+}
+
+static int push_tlv_header(cd_t connection, enum tlv_type type, size_t size)
+{
+        return 0;
+}
+
+struct tlv * get_tlv()
+{
+        return NULL;
+}
+
+
+void get_last_data(cd_t connection)
+{
+
+}
diff --git a/src/device/protocol_device_private.h b/src/device/protocol_device_private.h
new file mode 100755
index 0000000..0fb46c7
--- /dev/null
+++ b/src/device/protocol_device_private.h
@@ -0,0 +1,37 @@
+#ifndef PROTOCOL_DEVICE_PRIVATE_H
+#define PROTOCOL_DEVICE_PRIVATE_H
+
+#define MAX_PACKET_SIZE_OUT     (64)
+#define MAX_PACKET_SIZE_IN	(512)
+#define MAX_CONNECTIONS		(1UL)
+
+/**
+ * Device's view of connection to daemon.
+ */
+struct connection_t {
+        /**
+	 * Initially 0, non-zero when connection is open, 0 when connection
+	 * is closed again.
+	 */
+        int is_live;
+
+        /** Daemon IP adress */
+        IPAddress address;
+
+        /** Time last packet was reveived */
+        time_t last_packet_sec;
+
+        /** Incoming packet buffer */
+        char inp_buf[MAX_PACKET_SIZE_IN];
+
+        /** Incoming packet cursor */
+        size_t inp_crs;
+
+        /** Outgoing packet buffer */
+        char outp_buf[MAX_PACKET_SIZE_OUT];
+
+        /** Outgoing packet cursor */
+        size_t outp_crs;
+};
+
+#endif /* PROTOCOL_DEVICE_PRIVATE_H */
\ No newline at end of file