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e523b6b424
This commit adds a new `toranj` test script to test IPv6 traffic
exchange over multiple hops in a network with chain topology:
r1 ----- r2 ---- r3 ----- r4
/\ | | /\
/ \ | | / \
fed1 sed1 sed2 sed3 sed4 fed4
Traffic flow:
- From first router to last router
- From SED child of last router to SED child of first router
- From FED child of first router to FED child of last router
The test covers the following:
- Verifies Address Query process over multi-hop to routers and FEDs
- Verifies Mesh Header frame forwarding over multiple routers.
- Verifies forwarding of large IPv6 messages (1000 bytes) requiring
lowpan fragmentation.