[riot-notifications] [RIOT-OS/RIOT] tools/zep_dispatch: add support for advanced topologies (#15773)
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Thu Jan 14 19:42:48 CET 2021
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### Contribution description
This extends the ZEP dispatcher with support for advanced topologies.
A topology can be specified in a simple file format
<node_a> <node_b> [weight_ab] [weight_ba]
This line defines a connection between `<node_a>` and `<node_b>`.
The weight of the edge `<node_a>` -> `<node_b>` is `<weight_ab>`.
An edge weight is a float value between 0 and 1 that represents the probability of a successful packet transmission on that path.
A weight of `0` would mean no connection, whereas a weight of `1` would be a perfect connection. Intermediate values are possible, e.g. `0.6` would result in a packet loss probability of 40%.
The weights can be omitted.
If both weights are omitted, a perfect connection is assumed.
If `<weight_ba>` is omitted, a connection is assumed and `<weight_ab>` is used for both directions.
#### Example topology
# A and B are connected with an ideal link
# A and C are connected with a symmetric link with 10% packet loss
A C 0.9
# B and C are on an asymmetric connection
# The path B -> C has 60% packet loss while C -> B has 30% packet loss
B C 0.4 0.7
### Testing procedure
- start the dispatcher
make -C dist/tools/zep_dispatch run
- connect three `native` nodes
make -C examples/gnrc_networking USE_ZEP=1 all term # x 3
- generate a graph of the topology
make -C dist/tools/zep_dispatch graph
The nodes can all ping each other, but with varying packet loss
ping ff02::1 -c 10
12 bytes from fe80::25a:4550:a00:9f82%7: icmp_seq=0 ttl=64 rssi=255 dBm time=0.512 ms
12 bytes from fe80::25a:4550:a00:a885%7: icmp_seq=1 ttl=64 rssi=255 dBm time=0.276 ms
12 bytes from fe80::25a:4550:a00:a885%7: icmp_seq=5 ttl=64 rssi=255 dBm time=0.552 ms
12 bytes from fe80::25a:4550:a00:a885%7: icmp_seq=6 ttl=64 rssi=255 dBm time=0.376 ms
12 bytes from fe80::25a:4550:a00:9f82%7: icmp_seq=7 ttl=64 rssi=255 dBm time=0.591 ms
12 bytes from fe80::25a:4550:a00:a885%7: icmp_seq=7 ttl=64 rssi=255 dBm time=0.623 ms (DUP!)
12 bytes from fe80::25a:4550:a00:a885%7: icmp_seq=8 ttl=64 rssi=255 dBm time=0.517 ms
--- ff02::1 PING statistics ---
10 packets transmitted, 6 packets received, 1 duplicates, 40% packet loss
round-trip min/avg/max = 0.276/0.492/0.623 ms
### Issues/PRs references
Examples: Fixes #1234. See also #5678. Depends on PR #9876.
Please use keywords (e.g., fixes, resolve) with the links to the issues you
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is merged. See https://help.github.com/articles/closing-issues-using-keywords/.
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-- Commit Summary --
* cpu/native: export send() as real_send()
* socket_zep: include HW address with HELLO packet
* tools/zep_dispatch: add support for topologies
-- File Changes --
M cpu/native/include/native_internal.h (1)
M cpu/native/socket_zep/socket_zep.c (17)
M cpu/native/syscalls.c (2)
M dist/tools/zep_dispatch/Makefile (27)
A dist/tools/zep_dispatch/README.md (46)
A dist/tools/zep_dispatch/example.topo (7)
M dist/tools/zep_dispatch/main.c (174)
A dist/tools/zep_dispatch/topology.c (272)
A dist/tools/zep_dispatch/topology.h (18)
A dist/tools/zep_dispatch/zep_parser.c (78)
A dist/tools/zep_dispatch/zep_parser.h (6)
-- Patch Links --
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