Thomas Kolb
97a23701d0
Handle retransmits inside the connection module
2024-12-12 19:44:07 +01:00
Thomas Kolb
ec3244a61f
Add a module to manage a list of connections
2024-12-12 19:44:07 +01:00
Thomas Kolb
a0623668a7
Do all time calculations in uint64_t
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This prevents loss of precision that occurs with double-precision floats if
timestamps become very large. Timestamps are already large if they contain a
UNIX time value (requires 60 bits; double has 53 bit resolution).
2024-12-12 19:44:07 +01:00
Thomas Kolb
02a2afbc5b
connection: do not send ACKs for empty packets
2024-12-12 19:44:07 +01:00
Thomas Kolb
307fdc657d
connection: handle ACKs from empty packets correctly
2024-12-12 19:44:07 +01:00
Thomas Kolb
547a39508b
Handle received packets
2024-12-12 19:44:07 +01:00
Thomas Kolb
be607acbc2
connection: use correct addresses for empty packets
2024-12-12 19:44:07 +01:00
Thomas Kolb
729d61feb7
l2udp: Use the new layer2 connection module
2024-12-12 19:44:07 +01:00
Thomas Kolb
a455fac050
connection.h: fix comment
2024-09-20 23:38:54 +02:00
Thomas Kolb
44921bd65d
Decrease the AGC bandwidth during signal acquisition
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This prevents rapid squelch activation/deactivation if only noise is present.
The AGC bandwidth was tuned such that it still allows preambles to be detected
reliably.
2024-09-20 23:10:49 +02:00
Thomas Kolb
ccd9af6664
Delay squelch activation by 2 ms
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Delaying the squelch activation by 2 ms helps to avoid dropped samples if the
signal is barely above the squelch threshold.
2024-09-20 23:08:43 +02:00
Thomas Kolb
4dc2c60c8b
rx: reduce squelch threshold from 10 to 6 dB
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During tests it was determined that this is much more reliable. The theory is
that the first packet of a burst was frequently not detected because the
squelch opened too late if the channel was very noisy.
Unfortunately, the squelch now opens very often even if no signal is present.
This will be improved in the future.
2024-09-12 23:52:33 +02:00
Thomas Kolb
706a1eb437
freq_est: make ramp-up delta phase check more strict
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This should help with occasional jumps in the estimated carrier frequency on
receivers running frequency tracking.
2024-09-12 23:49:57 +02:00
Thomas Kolb
eb802629a1
layer1/rx: calculate EVM during header and data reception
2024-09-07 00:48:11 +02:00
Thomas Kolb
79c340c20d
connection: add state checks
2024-08-25 23:27:22 +02:00
Thomas Kolb
fc9e5c5229
Combine layer2_rx and layer2_tx in a new connection module
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The new module is not used yet, but this is a preparation for the future
multi-client networking support.
2024-08-25 22:26:56 +02:00
Thomas Kolb
899152a530
Remove config.h from Git; must be adapted by the user
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A template for the config file is provided in src/config.h.template. It must be
copied to src/config.h and adapted for force users to set their own station
call sign.
2024-08-25 20:26:41 +02:00
Thomas Kolb
2e91fd7c42
Apply free software+documentation licenses
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All code is now licensed under GPLv3+. The documentation is licensed under
CC BY-SA 4.0.
This is now officially free software! \o/
2024-08-23 11:53:40 +02:00
Thomas Kolb
017eb221f1
Integrate the interleaver
2024-08-16 22:14:07 +02:00
Thomas Kolb
325abdbd02
packet_queue: allow max. 15 packets to be queue (transmit window)
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16 is not allowed because it leads to an overflow in sequence numbers, making
them ambiguous.
2024-08-09 22:22:01 +02:00
Thomas Kolb
6d9068f63d
define INTERLEAVE_DISTANCE
2024-08-09 22:18:20 +02:00
Thomas Kolb
2ddb8aa18c
Randomize retransmit time
2024-08-09 22:16:14 +02:00
Thomas Kolb
d2ef6d9741
Remove empty packets from the queue after their first transmission
2024-07-27 00:50:04 +02:00
Thomas Kolb
04dcfff6fd
Do not transmit an empty packet if an empty packet was received
2024-07-27 00:33:47 +02:00
Simon Ruderich
9990aa5fbb
main: check return value of layer2_tx_fill_packet_queue()
2024-07-24 20:20:36 +02:00
Simon Ruderich
52f45cb433
layer2: check return values when adding empty packets
2024-07-24 20:20:36 +02:00
Simon Ruderich
4e2815923c
layer2: handle invalid message types just in case
2024-07-23 09:24:32 +02:00
Simon Ruderich
766caf7e07
layer2/packet_structs: use variable to reduce duplication
2024-07-23 09:15:56 +02:00
Simon Ruderich
b3a49fe0ba
layer2: update comments, use constant
2024-07-23 09:15:34 +02:00
Simon Ruderich
8aacbaf8c3
layer2/packet_queue: remove unused function packet_queue_can_add_packet()
2024-07-23 08:41:42 +02:00
Simon Ruderich
9845514a46
layer2/packet_queue: permit using full queue size
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Previously, only PACKET_QUEUE_SIZE - 1 elements could be stored.
2024-07-23 08:41:25 +02:00
Thomas Kolb
10a869d1a2
Layer 2: send Empty Packet acknowledgements if there’s nothing else to transmit
2024-07-22 22:19:23 +02:00
Thomas Kolb
c9916c08da
Add a simple interleaver implementation (not used yet)
2024-07-21 17:23:15 +02:00
Thomas Kolb
04f29b94bf
rx: show AGC gain after preamble, header and data
2024-07-20 22:33:08 +02:00
Thomas Kolb
38010ea672
rx-debugging: always dump symbols on packet boundaries
2024-07-20 22:30:27 +02:00
Thomas Kolb
12e727be00
packet_structs: add function to dump a packet header to the log
2024-07-20 22:29:04 +02:00
Thomas Kolb
3068db1d50
Handle retransmit timeouts
2024-07-20 01:04:03 +02:00
Thomas Kolb
fe684f7a1d
Fixed stack overflow in transmit()
2024-07-20 01:03:31 +02:00
Thomas Kolb
db2700c0f7
layer2_decode_packet_header: fixed rx_seq_nr readout
2024-07-20 01:02:42 +02:00
Thomas Kolb
bfe1cce6e3
packet_queue: wrap sequence number in packet_queue_delete()
2024-07-20 01:01:55 +02:00
Thomas Kolb
ac0fb54623
layer2_tx: fixed logging
2024-07-20 01:01:35 +02:00
Thomas Kolb
3b7d6baa74
layer2_tx: fixed packet size
2024-07-20 01:01:01 +02:00
Thomas Kolb
bcbcf5aeff
Layer 2: Added logging for retransmit handling
2024-07-20 00:26:53 +02:00
Thomas Kolb
d449e31586
logger: show module name
2024-07-20 00:04:32 +02:00
Thomas Kolb
041255e15f
layer2_tx: Fixed stack-use-after-return
2024-07-19 22:26:02 +02:00
Thomas Kolb
725a0ffd21
Ignore the squelch while receiving a packet
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Before this commit, samples could be dropped during packet reception, which for
sure destroys the current packet and potentially the following one. Now samples
are stored even if the squelch „closes“, and decoding will potentially fail due
to high noise, but not due to missing samples.
2024-07-19 22:11:29 +02:00
Thomas Kolb
48f061e334
Handle sequence numbers
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This should enable basic retransmission handling.
2024-07-18 23:26:57 +02:00
Thomas Kolb
93aa429f4f
Fixed unused variable warning
2024-07-18 22:58:13 +02:00
Thomas Kolb
a6464a28b8
Layer 2 received packet handling
2024-07-18 22:56:42 +02:00
Thomas Kolb
7381c7e808
Integrate new layer2 TX packet handling
2024-07-18 22:23:24 +02:00