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t2trg / transports

Discovering and negotiating alternative transports for thing-to-thing communication
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Congestion control over SMS #11

Closed ektrah closed 4 years ago

ektrah commented 5 years ago

Do retransmissions with exponential back-off make sense for SMS?

bsilverajan commented 5 years ago

Giving this a little thought, I'd go with saying yes, as long as the MAX_RETRANSMIT value is kept low (which the current default of 4 seems to be).

However it could potentially open a use case for abuse of SMS transmissions to unsuspecting receivers or battery drain attacks (the latter also affecting non-SMS CoAP nodes), if the MAX_RETRANSMIT parameter is set to a high value.

bsilverajan commented 5 years ago

Crossreferencing this to #14

bsilverajan commented 5 years ago

Update:

The LWM2M spec has this to say about SMS binding: "CoAP retransmission is disabled for this binding."