Modifying the max route cost

[kmfnjtze8888]

Hello,

What are potential serious consequences for modifying some constants in mle_types.hpp? For example, I wanted to test MLE Long Routes, but the kMaxRouteCost of 127 seems a little high, and I am worried it might use too much ram. I was thinking of decreasing it to 87 or 88 for a maximum of 22 hops, assuming each hop has a link cost of 4. Would that cause issues?

[jwhui]

Note that the OPENTHREAD_CONFIG_MLE_LONG_ROUTES_ENABLE feature is experimental and not conformant to the Thread Specification. That said, setting the max route cost to a lower value should not harm anything as long as you do not expect to have paths that exceed that limit.

As for the other constants in mle_types.hpp, they are typically specified in the Thread Specification. Changing those values would make the implementation non-conformant to the Thread Specification. The side-effect of changing a given value really depends on the constant being changed.