Added netty support

[codecov[bot]]

Codecov Report

Patch coverage: 88.33% and project coverage change: -0.06 :warning:

Comparison is base (9eb9b90) 93.01% compared to head (cb33848) 92.95%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #55 +/- ## ============================================ - Coverage 93.01% 92.95% -0.06% - Complexity 1912 1930 +18 ============================================ Files 124 128 +4 Lines 4250 4299 +49 Branches 603 604 +1 ============================================ + Hits 3953 3996 +43 - Misses 162 166 +4 - Partials 135 137 +2 ``` | [Impacted Files](https://app.codecov.io/gh/open-coap/java-coap/pull/55?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap) | Coverage Δ | | |---|---|---| | [...encoap/transport/mbedtls/DtlsTransportContext.java](https://app.codecov.io/gh/open-coap/java-coap/pull/55?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap#diff-Y29hcC1tYmVkdGxzL3NyYy9tYWluL2phdmEvb3JnL29wZW5jb2FwL3RyYW5zcG9ydC9tYmVkdGxzL0R0bHNUcmFuc3BvcnRDb250ZXh0LmphdmE=) | `66.66% <66.66%> (ø)` | | | [...va/org/opencoap/coap/netty/NettyCoapTransport.java](https://app.codecov.io/gh/open-coap/java-coap/pull/55?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap#diff-Y29hcC1uZXR0eS9zcmMvbWFpbi9qYXZhL29yZy9vcGVuY29hcC9jb2FwL25ldHR5L05ldHR5Q29hcFRyYW5zcG9ydC5qYXZh) | `88.46% <88.46%> (ø)` | | | [.../main/java/org/opencoap/coap/netty/NettyUtils.java](https://app.codecov.io/gh/open-coap/java-coap/pull/55?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap#diff-Y29hcC1uZXR0eS9zcmMvbWFpbi9qYXZhL29yZy9vcGVuY29hcC9jb2FwL25ldHR5L05ldHR5VXRpbHMuamF2YQ==) | `90.00% <90.00%> (ø)` | | | [...encoap/transport/mbedtls/MbedtlsCoapTransport.java](https://app.codecov.io/gh/open-coap/java-coap/pull/55?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap#diff-Y29hcC1tYmVkdGxzL3NyYy9tYWluL2phdmEvb3JnL29wZW5jb2FwL3RyYW5zcG9ydC9tYmVkdGxzL01iZWR0bHNDb2FwVHJhbnNwb3J0LmphdmE=) | `90.62% <100.00%> (+3.12%)` | :arrow_up: | | [...c/main/java/org/opencoap/coap/netty/CoapCodec.java](https://app.codecov.io/gh/open-coap/java-coap/pull/55?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap#diff-Y29hcC1uZXR0eS9zcmMvbWFpbi9qYXZhL29yZy9vcGVuY29hcC9jb2FwL25ldHR5L0NvYXBDb2RlYy5qYXZh) | `100.00% <100.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/open-coap/java-coap/pull/55/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-coap)

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