1.4.0

This release adds and improves CoAP Observe support (PRs #48, #49, #50).

1.3.29

Included changes from #46
Other: CI maintenance updates

1.3.28

update for #42 #37 .

1.3.25

update for #26 issue.

1.3.24

update for #31

1.3.23

user can set own message id : #30

1.3.22

bug fixed : #27
add esp8266 sample/workflow.

1.3.21

update for #22 Arduino/ESP32 STL compatible.

1.3.20

update for #20 #21

1.3.19

update for #18 .