update copyright info

update license to GPLv2 and GPLv3

[6LoWPAN] - Improved interface with MAC-enabled device drivers. TODO: update units, check return types

[Ethernet] - Fixed heap-use-after-free and memory leak

[mDNS] - Added possibility to re-init mDNS-module should fix #382

[Ethernet] - Removed discartion when failed to determining link layer address

[Ethernet] - Fixed typos

[Ethernet] - Full PoC of seperation of ethernet in standalone protocols with its own queues and its own protocol definition.

Seperation of ethernet from the stack

Add pico_constants to pico_stack.h so that pico_time is known

Add pico_constants to pico_stack.h so that pico_time is known

Revamping timer API to fix #308

Added function pico_frame_dst_is_unicast()

unified notification for icmp Reassembly error. Fixed misplaced
mempressure state.

Updated Copyright information.

Coding style enforced.

AODV: initial code structure for the module (#219)

Implemented "packet too big" notification, when trying to route packets

that don't fit the destination device/network

Also, linked to the forwarding engine of ipv4.

Made MTU configurable from dev

Also, fixed a problem with UDP fragmentation

Added function pico_stack_recv_zerocopy_ext_buffer_notify()

Reworked ETH support

- ETH specific functions are compiled out if not needed
- strict checking against ethernet protocol vs IP protocol
- meet requirements for QA tests on invalid ETH packets (bug #182)

Refactored IP address comparison into one centralized function

Implement pico_stack_recv_zerocopy_ext_buffer

Fixed some unseen compiler warnings discovered using TiCS

Added declaration for pico_stack_recv_zerocopy()

Removed two dead functions in pico_stack.c

Fixed #118. New compare function for sequence numbers. Should wrap correctly.

Fixed non-compliant header guard names

Looking over timer initialization for failure. Pico_stack_init() may now fail.

Fixed #100

better timer debug

Full refactoring of TCP timers!

Refactoring of TCP timers.

Added uncrustify. Enforced some coding rules. Added "make style" target.

Promoted pico_tick to uint64, created pico_time to diff the time variables

Issue #17. Fixed warnings (part three)

Issue #17. Fixed warnnings part two.

Issue #28. Exported pico_timer_cancel

GitHub Issue #28 related: Added pico_timer_cancel

pico_timer_add() now returns a "struct pico_timer*", which is
now an opaque structure exported in the API.

The same pointer can be passed as the only argument to pico_timer_cancel() in order
to cancel the execution of a timer.

In the check_timer routine, invalid/cancelled timers are skipped with no effect.

This was tricky to hack. The heap cannot be traced with pointers to pico_timers
because the heap keeps moving in memory. The record in the heap now only holds the
reference to the actual timer, and the expire field (the latter allowing heap ordering).

This is also an optimization in terms of contiguous memory required by the heap,
because each member is now only eight bytes long, and the actual timer is now held in a
separate place in memory. The cost of adding a timer now is two allocations.
The cancel function is O(n).

Task #540 Refactoring and improvement of DHCP client

pico_rand_feed(uint32_t feed) made public

Timers warning made configurable and increased

Changed LICENSE to GPL2. Removed the do-not-distribute clause from the source headers

Added random number generation (fixes #175)

Added copyright notice on top of each file.

(closes issue #100)

Added timers. Arp stale implemented with timers.

Receive socket functions: done

re-added transport_send function to sock interface

Generic function for transport layer recv

Removed unused interfaces in stack

Using ticks

Some rework of the protocol interface

Reworked ARP a bit, forward now working.

Added icmp ttl_expired

Forward skeleton/icmp host unreach

Added icmp proto unreachable when protocols is not supported.

Implemented ICMP port unreachable for non-reachable local sockets.

Protocol registration, init function for stack.

Added vde test

Reorganized directory structure.