Thomas Kolb
f895adf877
digipeater: rename interval to cycle
...
Interval suggests a regular timing structure which is not intended in this
construct and therefore is misleading.
2024-12-12 19:44:07 +01:00
Thomas Kolb
1c8e46f54a
digipeater: improve beacon handling
2024-12-12 19:44:07 +01:00
Thomas Kolb
580e4005ed
digipeater: enqueue packets in the correct connection queue
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So far, only IPv6 is supported.
2024-12-12 19:44:07 +01:00
Thomas Kolb
e4961bf519
WIP: handle packets from the TUN device in digipeater
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This is only a backup commit.
2024-12-12 19:44:07 +01:00
Thomas Kolb
816d753cfb
tundev: remove IFF_NO_PI
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Without this flag the kernel adds packet information to each packet. The
interesting part of that information is the EtherType of the packet, which
simplifies handling.
2024-12-12 19:44:07 +01:00
Thomas Kolb
774f5c0420
l2udptest_client: fix compilation
2024-12-12 19:44:07 +01:00
Thomas Kolb
f51b1da9d5
connection: calculate IPv6 address for peer
2024-12-12 19:44:07 +01:00
Thomas Kolb
339dc5490c
Add missing call to digipeater_end_interval()
2024-12-12 19:44:07 +01:00
Thomas Kolb
f3b6ab1a29
digipeater: add one-shot packet queue and interval handling
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The oneshot queue is for connection management frames that are only sent once,
at the beginning of the next burst. An example is the Connection Reset packet.
Intervals define the boundary between the handling of different connections.
The interval can be either ended by a packet with TX Request set, or by a
timeout. In either case, forwarding of packets to the current connection stops
and the connection is re-scheduled to a later point in time.
2024-12-12 19:44:07 +01:00
Thomas Kolb
01edbb1db1
WIP: managing multiple connections
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Working towards handling multiple connections. A lot is still missing.
2024-12-12 19:44:07 +01:00
Thomas Kolb
6e303e8aed
WIP: digipeater module managing multiple connections
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Backup commit. This is a basic setup with lots of TODOs and errors. Will not
compile yet.
2024-12-12 19:44:07 +01:00
Thomas Kolb
8572018c4e
l2/connection: refactoring
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- split handle_packet() in two functions: the first does basic checks and calls
the second one. This allows to do the basic checks externally (in the
multi-connection management module) without duplicating them.
- use the new layer2_encode_packet() function.
2024-12-12 19:44:07 +01:00
Thomas Kolb
16f7ae5242
l2/packet_structs: add function to encode a complete packet
2024-12-12 19:44:07 +01:00
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
ec9e893c73
l2udptest: replace by two programs: client and digipeater
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Both are identical so far, this is just an infrastructure commit.
2024-12-12 19:44:07 +01:00
Thomas Kolb
227837623c
Remove empty packet from queue after burst was transmitted
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
3189aac2ab
Pass received packets to layer 2 processing
2024-12-12 19:44:07 +01:00
Thomas Kolb
3c7caeda1b
Basic infrastructure for layer2-over-udp test
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
c52d0766d7
Remove obsolete compile_flags.txt
2024-08-23 19:52:24 +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
Simon Ruderich