A report summarizing the contents of the "iRIC version 4 release event" held at the Doboku Kaikan on June 28 has been released below.
https://qiita.com/nkmr_RL/items/52958f745c269cbb1c23
In this report created by Mr. Nakamori of RiverLINK Co., Ltd., the materials used at the release event are also available in PDF format.
If you were unable to attend, or would like to see the materials again, please take a look.