void main(void)
{
bool send_crypt_data = false;
bool tx_success = false;
gzp_id_req_res_t id_req_status;
uint8_t payload[GZLL_MAX_PAYLOAD_LENGTH];
mcu_init();
// Initialize Gazell Link Layer
gzll_init();
// Initialize Gazell Pairing Library
gzp_init();
EA = 1;
while(true)
{
payload[0] = ~P0;
// Send every other packet as encrypted data
if(send_crypt_data)
{
// Send encrypted packet using the Gazell pairing library
tx_success = gzp_crypt_data_send(payload, GZP_ENCRYPTED_USER_DATA_MAX_LENGTH);
}
else
{
// Send packet as plaintext on pipe 2
gzll_tx_data(payload, GZLL_MAX_FW_PAYLOAD_LENGTH, 2);
while(gzll_get_state() != GZLL_IDLE)
;
tx_success = gzll_tx_success();
}
send_crypt_data = !send_crypt_data;
// If data transfer failed
if(!tx_success)
{
// Send "system address request". Needed for sending any user data to Host.
gzp_address_req_send();
// Send "Host ID request". Needed for sending encrypted user data to host.
id_req_status = gzp_id_req_send();
}
// If waiting for Host to grant or reject ID request
if(id_req_status == GZP_ID_RESP_PENDING)
{
// Send new ID request for fetching response
id_req_status = gzp_id_req_send();
}
}
}
static void read_keyboard_and_send(void)
{
uint8_t keyboard_packet[NRFR_KEYBOARD_PACKET_LENGTH];
// "Scan" keyboard.
keyboard_get_non_empty_packet(keyboard_packet);
// Send address request if required.
if(!host_id_received && !system_addr_received)
{
system_addr_received = gzp_address_req_send();
}
/* Send Host ID request if required. This may take a few attempts
* as the Host may require some time to generate the Host ID. */
if(!host_id_received && system_addr_received )
{
while(send_host_id_req() == GZP_ID_RESP_PENDING);
}
/* After receiving the Host ID we send one packet in order
* to update the dynamic key.
*/
if(host_id_received && !dyn_key_ok)
{
bool keyboard_send_ok = true;
keyboard_send_ok = gzp_crypt_data_send(keyboard_packet, NRFR_KEYBOARD_PACKET_LENGTH);
if(!keyboard_send_ok)
{
host_id_received = false;
}
else
{
dyn_key_ok = true;
}
}
/* If we have the Host ID and dynamic key we can transmit encrypted data.
*/
if(host_id_received && dyn_key_ok)
{
bool keyboard_send_ok = true;
keyboard_send_ok = gzp_crypt_data_send(keyboard_packet, NRFR_KEYBOARD_PACKET_LENGTH);
if(keyboard_send_ok)
{
// Wait until button is depressed.
while(nrf_gpio_pin_read(BUTTON_SEND_KEYBOARD_DATA) == 0)
{}
// Send empty keyboard packet to release all keys.
keyboard_get_empty_packet(keyboard_packet);
keyboard_send_ok = gzp_crypt_data_send(keyboard_packet, NRFR_KEYBOARD_PACKET_LENGTH);
}
if(!keyboard_send_ok)
{
dyn_key_ok = false;
}
}
}