use socket mode instead of rtm

[llimllib]

Slack loves to change their bot API every year or so, and this is the new method: https://api.slack.com/apis/connections/socket

[eheydrick]

Any update on this? Slack is disabling custom legacy bots and the RTM API on March 31st, 2025.
https://api.slack.com/changelog/2024-09-legacy-custom-bots-classic-apps-deprecation

[llimllib]

none, I haven't been using limbo so unless somebody does something it'll be deceased

PRs welcome but I'm unlikely to do them