// Assume a request as acknowledged and delete it from the request_buffer and request_queue.
void remove_request(uint8_t sender_id, uint8_t request_sender_id, uint32_t packet_counter)
{
if (request_sender_id != 0) // if acknowledge is not meant for the base station (which has device id 0)
{
UART_PUTS("Ignoring ack (request not from this device).\r\n");
}
else
{
uint8_t rq_slot;
for (rq_slot = 0; rq_slot < REQUEST_QUEUE_RECEIVERS; rq_slot++)
{
if (request_queue[rq_slot][0] == sender_id)
{
// Because we use a fifo queue, the first buffered element has to be the one that is acknowledged.
// We don't need to check the others.
uint8_t rb_slot = request_queue[rq_slot][1];
{
if (request_buffer[rb_slot].packet_counter == packet_counter)
{
uint8_t i;
UART_PUTF("Removing request from request buffer slot %u.\r\n", rb_slot);
// remove from request buffer
request_buffer[rb_slot].command_id = RS_UNUSED;
// remove from request queue
for (i = 1; i < REQUEST_QUEUE_PACKETS; i++)
{
request_queue[rq_slot][i] = request_queue[rq_slot][i + 1];
}
request_queue[rq_slot][REQUEST_QUEUE_PACKETS] = RS_UNUSED;
// delete request queue entry if no more packets in this queue_request
if (request_queue[rq_slot][1] == RS_UNUSED)
{
UART_PUTF("Request queue %u is now empty.\r\n", rq_slot);
request_queue[rq_slot][0] = RS_UNUSED;
}
print_request_queue();
}
else
{
UART_PUTS("Warning: Sender ID from ack found in queue, but Packet Counter does not match.\r\n");
}
return;
}
}
}
// After the last retry, a packet is immediately removed from the queue, and therefore not found if it is acknowledged.
UART_PUTS("Warning: Acknowledged request not found in queue (could have been the last retry).\r\n");
}
}
int main(void)
{
uint8_t aes_key_nr;
uint8_t loop = 0;
uint8_t loop2 = 0;
// delay 1s to avoid further communication with uart or RFM12 when my programmer resets the MC after 500ms...
_delay_ms(1000);
util_init();
check_eeprom_compatibility(DEVICETYPE_BASESTATION);
request_queue_init();
// read packetcounter, increase by cycle and write back
packetcounter = e2p_generic_get_packetcounter() + PACKET_COUNTER_WRITE_CYCLE;
e2p_generic_set_packetcounter(packetcounter);
// read device specific config
aes_key_count = e2p_basestation_get_aeskeycount();
device_id = e2p_generic_get_deviceid();
uart_init();
UART_PUTS("\r\n");
UART_PUTF4("smarthomatic Base Station v%u.%u.%u (%08lx)\r\n", VERSION_MAJOR, VERSION_MINOR, VERSION_PATCH, VERSION_HASH);
UART_PUTS("(c) 2012..2014 Uwe Freese, www.smarthomatic.org\r\n");
UART_PUTF("Device ID: %u\r\n", device_id);
UART_PUTF("Packet counter: %lu\r\n", packetcounter);
UART_PUTF("AES key count: %u\r\n", aes_key_count);
UART_PUTS("Waiting for incoming data. Press h for help.\r\n\r\n");
led_blink(500, 500, 3);
rfm12_init();
sei();
// ENCODE TEST (Move to unit test some day...)
/*
uint8_t testlen = 32;
uint8_t aes_key_num = 0;
memset(&bufx[0], 0, sizeof(bufx));
bufx[0] = 0xff;
bufx[1] = 0xb0;
bufx[2] = 0xa0;
bufx[3] = 0x3f;
bufx[4] = 0x01;
bufx[5] = 0x70;
bufx[6] = 0x00;
bufx[7] = 0x0c;
bufx[8] = 0xa8;
bufx[9] = 0x00;
bufx[10] = 0x20;
bufx[20] = 0x20;
eeprom_read_block (aes_key, (uint8_t *)(EEPROM_AESKEYS_BYTE + aes_key_num * 32), 32);
UART_PUTS("Using AES key ");
print_bytearray((uint8_t *)aes_key, 32);
UART_PUTS("Before encryption: ");
print_bytearray(bufx, testlen);
uint8_t aes_byte_count = aes256_encrypt_cbc(bufx, testlen);
UART_PUTF("byte count = %u\r\n", aes_byte_count);
UART_PUTS("After encryption: ");
print_bytearray(bufx, aes_byte_count);
aes256_decrypt_cbc(bufx, aes_byte_count);
UART_PUTS("After decryption: ");
print_bytearray(bufx, testlen);
while(1);
*/
while (42)
{
if (rfm12_rx_status() == STATUS_COMPLETE)
{
uint8_t len = rfm12_rx_len();
if ((len == 0) || (len % 16 != 0))
{
UART_PUTF("Received garbage (%u bytes not multiple of 16): ", len);
print_bytearray(bufx, len);
}
else // try to decrypt with all keys stored in EEPROM
{
bool crcok = false;
for (aes_key_nr = 0; aes_key_nr < aes_key_count ; aes_key_nr++)
{
memcpy(bufx, rfm12_rx_buffer(), len);
/*if (aes_key_nr == 0)
{
UART_PUTS("Before decryption: ");
print_bytearray(bufx, len);
}*/
e2p_basestation_get_aeskey(aes_key_nr, aes_key);
//UART_PUTS("Trying AES key 2 ");
//print_bytearray((uint8_t *)aes_key, 32);
aes256_decrypt_cbc(bufx, len);
//UART_PUTS("Decrypted bytes: ");
//print_bytearray(bufx, len);
crcok = pkg_header_check_crc32(len);
if (crcok)
{
//UART_PUTS("CRC correct, AES key found!\r\n");
UART_PUTF("Received (AES key %u): ", aes_key_nr);
print_bytearray(bufx, len);
decode_data(len);
break;
}
}
if (!crcok)
{
UART_PUTS("Received garbage (CRC wrong after decryption): ");
memcpy(bufx, rfm12_rx_buffer(), len);
print_bytearray(bufx, len);
}
UART_PUTS("\r\n");
}
//uart_hexdump((char *)bufcontents, rfm12_rx_len());
//UART_PUTS("\r\n");
// tell the implementation that the buffer can be reused for the next data.
rfm12_rx_clear();
}
// send data, if waiting in send buffer
if (send_data_avail)
{
uint8_t i;
// set AES key nr
aes_key_nr = hex_to_uint8((uint8_t *)cmdbuf, 1);
//UART_PUTF("AES KEY = %u\r\n", aes_key_nr);
// init packet buffer
memset(&bufx[0], 0, sizeof(bufx));
// set message type
uint8_t message_type = hex_to_uint8((uint8_t *)cmdbuf, 3);
pkg_header_set_messagetype(message_type);
pkg_header_adjust_offset();
//UART_PUTF("MessageType = %u\r\n", message_type);
uint8_t string_offset_data = 0;
/*
UART_PUTS("sKK00RRRRGGMM.............Get\r\n");
UART_PUTS("sKK01RRRRGGMMDD...........Set\r\n");
UART_PUTS("sKK02RRRRGGMMDD...........SetGet\r\n");
UART_PUTS("sKK08GGMMDD...............Status\r\n");
UART_PUTS("sKK09SSSSPPPPPPEE.........Ack\r\n");
UART_PUTS("sKK0ASSSSPPPPPPEEGGMMDD...AckStatus\r\n");
*/
// set header extension fields to the values given as hex string in the user input
switch (message_type)
{
case MESSAGETYPE_GET:
case MESSAGETYPE_SET:
case MESSAGETYPE_SETGET:
pkg_headerext_common_set_receiverid(hex_to_uint16((uint8_t *)cmdbuf, 5));
pkg_headerext_common_set_messagegroupid(hex_to_uint8((uint8_t *)cmdbuf, 9));
pkg_headerext_common_set_messageid(hex_to_uint8((uint8_t *)cmdbuf, 11));
string_offset_data = 12;
break;
case MESSAGETYPE_STATUS:
pkg_headerext_common_set_messagegroupid(hex_to_uint8((uint8_t *)cmdbuf, 5));
pkg_headerext_common_set_messageid(hex_to_uint8((uint8_t *)cmdbuf, 7));
string_offset_data = 8;
break;
case MESSAGETYPE_ACK:
pkg_headerext_common_set_acksenderid(hex_to_uint16((uint8_t *)cmdbuf, 5));
pkg_headerext_common_set_ackpacketcounter(hex_to_uint24((uint8_t *)cmdbuf, 9));
pkg_headerext_common_set_error(hex_to_uint8((uint8_t *)cmdbuf, 15));
// fallthrough!
case MESSAGETYPE_ACKSTATUS:
pkg_headerext_common_set_messagegroupid(hex_to_uint8((uint8_t *)cmdbuf, 17));
pkg_headerext_common_set_messageid(hex_to_uint8((uint8_t *)cmdbuf, 19));
string_offset_data = 20;
break;
}
uint8_t data_len_raw = 0;
// copy message data, which exists in all packets except in Get and Ack packets
if ((message_type != MESSAGETYPE_GET) && (message_type != MESSAGETYPE_ACK))
{
uint8_t data_len_raw = (strlen(cmdbuf) - 1 - string_offset_data) / 2;
//UART_PUTF("Data bytes = %u\r\n", data_len_raw);
uint8_t start = __HEADEROFFSETBITS / 8;
uint8_t shift = __HEADEROFFSETBITS % 8;
// copy message data, using __HEADEROFFSETBITS value and string_offset_data
for (i = 0; i < data_len_raw; i++)
{
uint8_t val = hex_to_uint8((uint8_t *)cmdbuf, string_offset_data + 2 * i + 1);
array_write_UIntValue(start + i, shift, 8, val, bufx);
}
}
// round packet length to x * 16 bytes
uint8_t packet_len = ((uint16_t)__HEADEROFFSETBITS + (uint16_t)data_len_raw * 8) / 8;
packet_len = ((packet_len - 1) / 16 + 1) * 16;
// send packet which doesn't require an acknowledge immediately
if ((message_type != MESSAGETYPE_GET) && (message_type != MESSAGETYPE_SET) && (message_type != MESSAGETYPE_SETGET))
{
send_packet(aes_key_nr, packet_len);
}
else // enqueue request (don't send immediately)
{
// header size = 9 bytes!
if (queue_request(pkg_headerext_common_get_receiverid(), message_type, aes_key_nr, bufx + 9, packet_len - 9))
{
UART_PUTF("Request added to queue (%u bytes packet).\r\n", packet_len);
}
else
{
UART_PUTS("Warning! Request queue full. Packet will not be sent.\r\n");
}
print_request_queue();
}
// clear cmdbuf to receive more input from UART
send_data_avail = false;
rfm12_tick();
led_blink(200, 0, 1);
}
// flash LED every second to show the device is alive
if (loop == 50)
{
led_blink(10, 10, 1);
loop = 0;
request_t* request = find_request_to_repeat(packetcounter + 1);
if (request != 0) // if request to repeat was found in queue
{
UART_PUTS("Repeating request.\r\n");
send_packet((*request).aes_key, (*request).data_bytes + 9); // header size = 9 bytes!
print_request_queue();
}
// Auto-send something for debugging purposes...
if (loop2 == 50)
{
//strcpy(cmdbuf, "s000102828300");
//send_data_avail = true;
loop2 = 0;
}
else
{
loop2++;
}
}
else
{
_delay_ms(20);
}
rfm12_tick();
loop++;
process_rxbuf();
if (uart_timeout > 0)
{
uart_timeout--;
if (uart_timeout == 0)
{
UART_PUTS("*** UART user timeout. Input was ignored. ***\r\n");
}
}
}
// never called
// aes256_done(&aes_ctx);
}
int main ( void )
{
uint8_t aes_key_nr;
uint8_t loop = 0;
uint8_t loop2 = 0;
uint8_t data[22];
sbi(LED_DDR, LED_PIN);
// delay 1s to avoid further communication with uart or RFM12 when my programmer resets the MC after 500ms...
_delay_ms(1000);
request_queue_init();
// read packetcounter, increase by cycle and write back
packetcounter = eeprom_read_dword((uint32_t*)EEPROM_POS_PACKET_COUNTER) + PACKET_COUNTER_WRITE_CYCLE;
eeprom_write_dword((uint32_t*)0, packetcounter);
uart_init(true);
UART_PUTS ("\r\n");
UART_PUTS ("Open Home Control Base Station V1.0\r\n");
UART_PUTS ("(c) 2012 Uwe Freese, www.open-home-control.com\r\n");
UART_PUTF ("Packet counter: %lu\r\n", packetcounter);
UART_PUTS ("Waiting for incoming data. Press h for help.\r\n");
rfm12_init();
sei();
// ENCODE TEST
/*
uint8_t testlen = 64;
eeprom_read_block (aes_key, (uint8_t *)EEPROM_POS_AES_KEY, 32);
UART_PUTS("Using AES key ");
printbytearray((uint8_t *)aes_key, 32);
UART_PUTS("Before encryption: ");
printbytearray(bufx, testlen);
unsigned long crc = crc32(bufx, testlen);
UART_PUTF("CRC32 is %lx (added as last 4 bytes)\r\n", crc);
UART_PUTS("1\r\n");
crc = crc32(bufx, testlen - 4);
UART_PUTS("2\r\n");
setBuf32(testlen - 4, crc);
UART_PUTS("Before encryption (CRC added): ");
printbytearray(bufx, testlen);
UART_PUTS("1\r\n");
uint8_t aes_byte_count = aes256_encrypt_cbc(bufx, testlen);
UART_PUTS("2\r\n");
UART_PUTS("After encryption: ");
printbytearray(bufx, aes_byte_count);
UART_PUTF("String len = %u\r\n", aes_byte_count);
UART_PUTS("1\r\n");
aes256_decrypt_cbc(bufx, aes_byte_count);
UART_PUTS("2\r\n");
UART_PUTS("After decryption: ");
printbytearray(bufx, testlen);
crc = getBuf32(testlen - 4);
UART_PUTF("CRC32 is %lx (last 4 bytes from decrypted message)\r\n", crc);
printbytearray(bufx, testlen);
UART_PUTS("After decryption (CRC removed): ");
printbytearray(bufx, testlen);
UART_PUTF("String len = %u\r\n", testlen);
while(1);
*/
while (42)
{
if (rfm12_rx_status() == STATUS_COMPLETE)
{
uint8_t len = rfm12_rx_len();
if ((len == 0) || (len % 16 != 0))
{
UART_PUTF("Received garbage (%u bytes not multiple of 16): ", len);
printbytearray(bufx, len);
}
else // try to decrypt with all keys stored in EEPROM
{
uint32_t assumed_crc;
uint32_t actual_crc;
for(aes_key_nr = 0; aes_key_nr < AES_KEY_EEPROM_COUNT ; aes_key_nr++)
{
//strncpy((char *)bufx, (char *)rfm12_rx_buffer(), len);
memcpy(bufx, rfm12_rx_buffer(), len);
/*if (aes_key_nr == 0)
{
UART_PUTS("Before decryption: ");
printbytearray(bufx, len);
}*/
eeprom_read_block (aes_key, (uint8_t *)(EEPROM_POS_AES_KEY + aes_key_nr * 32), 32);
//UART_PUTS("Trying AES key ");
//printbytearray((uint8_t *)aes_key, 32);
aes256_decrypt_cbc(bufx, len);
//UART_PUTS("Decrypted bytes: ");
//printbytearray(bufx, len);
assumed_crc = getBuf32(len - 4);
actual_crc = crc32(bufx, len - 4);
//UART_PUTF("Received CRC32 would be %lx\r\n", assumed_crc);
//UART_PUTF("Re-calculated CRC32 is %lx\r\n", actual_crc);
if (assumed_crc == actual_crc)
{
//UART_PUTS("CRC correct, AES key found!\r\n");
UART_PUTF("Received (AES key %u): ", aes_key_nr);
printbytearray(bufx, len - 4);
decode_data(len - 4);
break;
}
}
if (assumed_crc != actual_crc)
{
UART_PUTS("Received garbage (CRC wrong after decryption).\r\n");
}
UART_PUTS("\r\n");
}
//uart_hexdump((char *)bufcontents, rfm12_rx_len());
//UART_PUTS("\r\n");
// tell the implementation that the buffer can be reused for the next data.
rfm12_rx_clear();
}
// send data, if waiting in send buffer
if (send_data_avail)
{
uint8_t i;
uint8_t data_len_raw = strlen(sendbuf) / 2 - 2;
// round data length to 6 + 16 bytes (including padding bytes)
uint8_t data_len = (((data_len_raw + 9) / 16) + 1) * 16 - 10;
// set aes key nr
aes_key_nr = hex_to_uint8((uint8_t *)sendbuf, 0);
//UART_PUTF("AES KEY = %u\r\n", aes_key_nr);
// set command id
uint8_t command_id = hex_to_uint8((uint8_t *)sendbuf, 2);
// set data
for (i = 0; i < data_len_raw; i++)
{
data[i] = hex_to_uint8((uint8_t *)sendbuf, 4 + 2 * i);
}
// set padding bytes
for (i = data_len_raw; i < data_len; i++)
{
data[i] = 0;
}
// send status packet immediately (command IDs are less than 128)
if (command_id < 128)
{
// set command id
bufx[5] = command_id;
// set data
memcpy(bufx + 6, data, data_len);
send_packet(aes_key_nr, data_len);
}
else // enqueue request (don't send immediately)
{
if (queue_request(data[0], command_id, aes_key_nr, data + 1))
{
UART_PUTS("Adding request to queue.\r\n");
}
else
{
UART_PUTS("Warning! Request queue full. Packet will not be sent.\r\n");
}
print_request_queue();
}
// clear send text buffer
send_data_avail = false;
rfm12_tick();
led_blink(200, 0, 1);
}
// flash LED every second to show the device is alive
if (loop == 50)
{
led_blink(10, 10, 1);
loop = 0;
if (set_repeat_request(packetcounter + 1)) // if request to repeat was found in queue
{
UART_PUTS("Repeating request.\r\n");
send_packet(0, 6);
print_request_queue();
}
// Auto-send something for debugging purposes...
if (loop2 == 50)
{
//strcpy(sendbuf, "008c0001003d");
//send_data_avail = true;
loop2 = 0;
}
else
{
loop2++;
}
}
else
{
_delay_ms(20);
}
rfm12_tick();
loop++;
process_rxbuf();
if (uart_timeout > 0)
{
uart_timeout--;
if (uart_timeout == 0)
{
UART_PUTS("*** UART user timeout. Input was ignored. ***\r\n");
}
}
}
// never called
// aes256_done(&aes_ctx);
}
