Protocol: implementation of device-side protocol.

Parts of protocol specific for device are implementepd to reflect the
fact that the device is a client. This effectively means that device
gets a single connection only and severe memory restrictions about
which the daemon might get informed about in the future.

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

1 files changed, 25 insertions, 2 deletions

diff --git a/src/device/protocol_device_private.h b/src/device/protocol_device_private.h
index 0fb46c7..29ff567 100755
--- a/src/device/protocol_device_private.h
+++ b/src/device/protocol_device_private.h
@@ -1,11 +1,28 @@
 #ifndef PROTOCOL_DEVICE_PRIVATE_H
 #define PROTOCOL_DEVICE_PRIVATE_H
 
+#include "net.h"
+
 #define MAX_PACKET_SIZE_OUT     (64)
+
+/* Maximum size of packet that can fit into the packet buffer. UDP can carry
+ * bigger packets but memory is hard to come by and more won't be needed
+ * anyway.
+ * */
 #define MAX_PACKET_SIZE_IN	(512)
+
+/**
+ * Device only gets one connection. Because daemon.
+ */
 #define MAX_CONNECTIONS		(1UL)
 
 /**
+ * Error which says that writing any more to packet buffer will overflow
+ * outgoing buffer.
+ */
+#define E_PACKET_OVERFLOW	(1 << 0)
+
+/**
  * Device's view of connection to daemon.
  */
 struct connection_t {
@@ -15,8 +32,8 @@ struct connection_t {
 	 */
         int is_live;
 
-        /** Daemon IP adress */
-        IPAddress address;
+	/** Network descriptor that maps to daemon */
+	int nd;
 
         /** Time last packet was reveived */
         time_t last_packet_sec;
@@ -32,6 +49,12 @@ struct connection_t {
 
         /** Outgoing packet cursor */
         size_t outp_crs;
+
+	/**
+	 * Next tlv to be returned via get_tlv. NULL initially and after last
+	 * element.
+	 * */
+	struct tlv next_tlv;
 };
 
 #endif /* PROTOCOL_DEVICE_PRIVATE_H */
\ No newline at end of file