Refactored TransportContext

[codecov[bot]]

Codecov Report

Base: 92.37% // Head: 92.39% // Increases project coverage by +0.01% :tada:

Coverage data is based on head (7a261c2) compared to base (e41e5b9). Patch coverage: 89.47% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #30 +/- ## ============================================ + Coverage 92.37% 92.39% +0.01% - Complexity 1852 1862 +10 ============================================ Files 125 125 Lines 4225 4247 +22 Branches 598 603 +5 ============================================ + Hits 3903 3924 +21 Misses 184 184 - Partials 138 139 +1 ``` | [Impacted Files](https://codecov.io/gh/open-coap/java-coap/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap) | Coverage Δ | | |---|---|---| | [...src/main/java/com/mbed/coap/packet/CoapPacket.java](https://codecov.io/gh/open-coap/java-coap/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap#diff-Y29hcC1jb3JlL3NyYy9tYWluL2phdmEvY29tL21iZWQvY29hcC9wYWNrZXQvQ29hcFBhY2tldC5qYXZh) | `91.66% <50.00%> (ø)` | | | [...java/com/mbed/coap/transport/TransportContext.java](https://codecov.io/gh/open-coap/java-coap/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap#diff-Y29hcC1jb3JlL3NyYy9tYWluL2phdmEvY29tL21iZWQvY29hcC90cmFuc3BvcnQvVHJhbnNwb3J0Q29udGV4dC5qYXZh) | `91.42% <91.42%> (+5.71%)` | :arrow_up: | | [...rc/main/java/com/mbed/coap/packet/CoapRequest.java](https://codecov.io/gh/open-coap/java-coap/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap#diff-Y29hcC1jb3JlL3NyYy9tYWluL2phdmEvY29tL21iZWQvY29hcC9wYWNrZXQvQ29hcFJlcXVlc3QuamF2YQ==) | `90.90% <100.00%> (+0.08%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap)

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