2.0.0

Upgrade to extend functionality to support native CCMP encryption by setting PMK globally and LMK per peer.

• Added member variable flag pmk_is_set to keep track if PMK is set or no.

• Added member variable array pmk with size 16 to store PMK globally.

• Added member function setPMK(const uint8_t *pmk_to_set) to set the PMK provided by the user.

• Added member function getPMK(uint8_t *pmk_buff) to get/retrieve the PMK that was previously set. Copies the content into the buffer that user provides.

• Changed name of static variable from LMK_LENGTH to KEY_LENGTH to make it more general as both PMK and LMK have the same length of 16 bytes each.

• Added bool encrypted flag in peer_t structure to keep track if a peer is encrypted or no.

• Set time_peer_added in peer_t structure to default value 0 to be able to tell that a peer is not in the list and not found.

• Added argument lmk to the function addPeer() to encrypt the peer. If null, peer will not be encrypted.

• Added structure espnow_frame_header_common_t to contain the MAC header which is common for unencrypted and CCMP encrypted frames.

• Modified and more more compact espnow_frame_format_t structure to include espnow_frame_header_common_t struct.

• Added structure espnow_frame_format_ccmp_t to handle CCMP encrypted frame.

• Modified espnow_frame_recv_info_t structure to include a pointer to espnow_frame_format_t and espnow_frame_format_ccmp_t. However one of them will be nullptr depending which frame comes in.

• Modified condition to not encrypt a peer. A peer cannot be encrypted if: LMK is nullptr OR peer's MAC is multicast/broadcast OR PMK has not been set yet.

• 🧙🏻‍♂️ 🪄 Modified rx_cb function. Here all the magick happens. Handles properly unencrypted or encrypted incoming frames. First it unpacks the incoming bytes into both unencrypted and encrypted structures. Then it checks if the fields containing the specific info for the frame align.