IEEE 802.15.4 Convergence Layer

Files
file	convergence_layer.c
	IEEE 802.15.4 Convergence Layer Implementation.
file	convergence_layer.h
	IEEE 802.15.4 Convergence Layer Implementation.

Data Structures
struct	transmit_ticket_t
	Bundle Queue Entry. More...

Macros
#define	CONVERGENCE_LAYER_QUEUE   10
	How many outgoing bundles can we queue?
#define	CONVERGENCE_LAYER_QUEUE_FREE   (0.2 * CONVERGENCE_LAYER_QUEUE)
	How many queue slots remain free for internal use?
#define	CONVERGENCE_LAYER_RETRIES   4
	How often shall we retransmit bundles before we notify routing.
#define	CONVERGENCE_LAYER_FAILED_RETRIES   15
	How often shell we retry to transmit, if it has not been transmitted at all?
#define	CONVERGENCE_LAYER_TIMEOUT   5
	How long shall we wait for an app-layer ACK or NACK? [in seconds].
#define	CONVERGENCE_LAYER_RETRANSMIT_TIMEOUT   0.5
	How long shell we wait before retransmitting an app-layer ACK or NACK? [in seconds].
#define	CONVERGENCE_LAYER_RETRANSMIT_TRIES   (CONVERGENCE_LAYER_TIMEOUT / CONVERGENCE_LAYER_RETRANSMIT_TIMEOUT)
	How often shall we retransmit?
#define	CONVERGENCE_LAYER_QUEUE_ACTIVE   0x01
	Bundle queue flags.
#define	CONVERGENCE_LAYER_COMPAT   0x00
	CL COMPAT VALUES.
#define	CONVERGENCE_LAYER_TYPE_DATA   0x10
	CL Header Types.
#define	CONVERGENCE_LAYER_FLAGS_FIRST   0x02
	CL Packet Flags.
#define	CONVERGENCE_LAYER_MASK_COMPAT   0xC0
	CL Field Masks.
#define	CONVERGENCE_LAYER_STATUS_OK   0x01
	CL Callback Status.
#define	CONVERGENCE_LAYER_PRIORITY_NORMAL   0x01
	CL Priority Values.
#define	CONVERGENCE_LAYER_MAX_LENGTH   115
	Maximum payload length of one outgoing frame.

Functions
	LIST (transmission_ticket_list)
	List to keep track of outgoing bundles.
	LIST (blocked_neighbour_list)
	List to keep track of blocked neighbours.
int	convergence_layer_is_blocked (rimeaddr_t *neighbour)
	Internal functions.
	PROCESS (convergence_layer_process,"CL process")
	CL process.
	PROCESS_NAME (convergence_layer_process)
	Convergence Layer Process.

Variables
int	convergence_layer_transmitting
	MUTEX to avoid flooding the MAC layer with outgoing bundles.
int	convergence_layer_slots
	Keep track of the allocated tickets.
int	convergence_layer_queue
	Keep track of the tickets in queue.
uint8_t	outgoing_sequence_number
	Use a unique sequence number of each outgoing segment.
uint8_t	convergence_layer_pending
	Indicate when a continue event or poll to ourselves is pending to avoid exceeding the event queue size.
struct etimer	convergence_layer_backoff
	Backoff timer.

Detailed Description