BOOST_FIXTURE_TEST_CASE( a_new_pdu_will_be_transmitted_if_the_last_was_acknowladged, running_mode )
{
transmit_pdu( { 1 } );
transmit_pdu( { 2 } );
transmit_pdu( { 3 } );
transmit_pdu( { 4 } );
BOOST_CHECK_EQUAL( next_transmit().buffer[ 2 ], 1u );
BOOST_CHECK_EQUAL( next_transmit().buffer[ 2 ], 1u );
// incomming PDU acknowledges
auto incomming = allocate_receive_buffer();
incomming.buffer[ 0 ] = 1 | 4;
incomming.buffer[ 1 ] = 0;
received( incomming );
// now the next pdu to be transmitted
BOOST_CHECK_EQUAL( next_transmit().buffer[ 2 ], 2u );
// next incomming PDU acknowledges, this time with NESN = 0
incomming = allocate_receive_buffer();
incomming.buffer[ 0 ] = 1;
incomming.buffer[ 1 ] = 25;
received( incomming );
// now the next pdu to be transmitted
BOOST_CHECK_EQUAL( next_transmit().buffer[ 2 ], 3u );
}
BOOST_FIXTURE_TEST_CASE( with_every_new_received_pdu_a_new_sequence_is_expected, running_mode )
{
BOOST_CHECK_EQUAL( next_transmit().buffer[ 0 ] & 0x4, 0 );
receive_pdu( { 1 }, false, false );
BOOST_CHECK_EQUAL( next_transmit().buffer[ 0 ] & 0x4, 0x4 );
receive_pdu( { 2 }, true, false );
BOOST_CHECK_EQUAL( next_transmit().buffer[ 0 ] & 0x4, 0 );
}
BOOST_FIXTURE_TEST_CASE( more_data_flag_is_added_if_pdu_is_added, running_mode )
{
// empty PDU without MD flag
auto first = next_transmit();
BOOST_CHECK_EQUAL( first.buffer[ 0 ] & 0x10, 0 );
transmit_pdu( { 0x01, 0x02, 0x03, 0x04 } );
auto next = next_transmit();
// must be the same PDU, as it was not acknowladged
BOOST_CHECK_EQUAL_COLLECTIONS( &first.buffer[ 2 ], &first.buffer[ first.size ], &next.buffer[ 2 ], &next.buffer[ next.size ] );
// sequence numbers and LLID must be equal
BOOST_CHECK_EQUAL( first.buffer[ 0 ] & 0xf, first.buffer[ 0 ] & 0xf );
}
BOOST_FIXTURE_TEST_CASE( sequence_number_and_next_sequence_number_must_be_0_for_the_first_pdu, one_element_in_transmit_buffer )
{
auto write = next_transmit();
BOOST_CHECK_EQUAL( write.buffer[ 0 ] & 0x4, 0 );
BOOST_CHECK_EQUAL( write.buffer[ 0 ] & 0x8, 0 );
}
BOOST_FIXTURE_TEST_CASE( more_data_flag_is_set_if_there_is_more_than_one_element_in_the_transmit_buffer, one_element_in_transmit_buffer )
{
transmit_pdu( { 0x01 } );
auto transmit = next_transmit();
BOOST_CHECK_EQUAL( transmit.buffer[ 0 ] & 0x10, 0x10 );
}
write_buffer ll_data_pdu_buffer< TransmitSize, ReceiveSize, Radio >::received( read_buffer pdu )
{
assert( pdu.buffer );
assert( pdu.buffer >= receive_buffer() );
assert( pdu.size >= pdu.buffer[ 1 ] + ll_header_size );
assert( end_receive_buffer() - pdu.buffer >= pdu.buffer[ 1 ] + ll_header_size );
assert( check_receive_buffer_consistency( "+received" ) );
// invalid LLID or resent?
if ( ( pdu.buffer[ 0 ] & 0x3 ) != 0 )
{
acknowledge( pdu.buffer[ 0 ] & nesn_flag );
// resent PDU?
if ( static_cast< bool >( pdu.buffer[ 0 ] & sn_flag ) == next_expected_sequence_number_ )
{
next_expected_sequence_number_ = !next_expected_sequence_number_;
if ( pdu.buffer[ 1 ] != 0 )
{
received_end_ = pdu.buffer + pdu.buffer[ 1 ] + ll_header_size;
// we received data, so we can not end up with the receive buffer beeing empty
assert( received_end_ != received_ );
}
}
}
assert( check_receive_buffer_consistency( "-received" ) );
return next_transmit();
}
BOOST_FIXTURE_TEST_CASE( the_transmitbuffer_will_yield_an_empty_pdu_if_the_buffer_is_empty, running_mode )
{
auto write = next_transmit();
BOOST_CHECK_EQUAL( write.size, 2u );
BOOST_CHECK_EQUAL( write.buffer[ 0 ] & 0x03, 1 );
BOOST_CHECK_EQUAL( write.buffer[ 1 ], 0u );
}
BOOST_FIXTURE_TEST_CASE( getting_an_empty_pdu_must_not_result_in_changing_allocated_transmit_buffer, running_mode )
{
auto trans = allocate_transmit_buffer();
std::fill( trans.buffer, trans.buffer + trans.size, 0x22 );
// this call should not change the allocated buffer
next_transmit();
BOOST_CHECK( std::find_if( trans.buffer, trans.buffer + trans.size, []( std::uint8_t b ) { return b != 0x22; } ) == trans.buffer + trans.size );
}
BOOST_FIXTURE_TEST_CASE( as_long_as_an_pdu_is_not_acknowlaged_it_will_be_retransmited, one_element_in_transmit_buffer )
{
for ( int i = 0; i != 3; ++i )
{
auto trans = next_transmit();
BOOST_REQUIRE_EQUAL( trans.size, 3u );
BOOST_CHECK_EQUAL( trans.buffer[ 1 ], 1u );
BOOST_CHECK_EQUAL( trans.buffer[ 2 ], 0x34u );
}
}
BOOST_FIXTURE_TEST_CASE( more_data_flag_is_not_set_if_only_one_element_is_in_the_transmit_buffer, one_element_in_transmit_buffer )
{
auto write = next_transmit();
BOOST_CHECK_EQUAL( write.buffer[ 0 ] & 0x10, 0 );
}
BOOST_FIXTURE_TEST_CASE( if_transmit_buffer_is_empty_mode_data_flag_is_not_set, running_mode )
{
auto write = next_transmit();
BOOST_CHECK_EQUAL( write.buffer[ 0 ] & 0x10, 0 );
}
