Implement Pdu::TryFrom<&[u8]>. #22
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Here's the promised Pdu::from implementation. I have used it to parse SMS from the storage of Mocor and MAUI dumbphones.
When reviewing, have a look in particular of the handling of the validity_period octet. Online sources I ran into suggest that it is optional, but I found that the octet is always present (i.e., I'm incrementing the offset unconditionally), its just sometimes 0. I don't care about the particular value for my use case.
Yeah, tests would be nice, but this is a hobby project and I may or may not get to it at some point.