TakBot was getting disconnected after a couple minutes of idle time, so I figured the server had started checking pings. I enabled TakBot to send a Ping every 30 seconds and the server always returns "NOK".
Looks like it's a documentation issue. The doc says "Ping" but the code looks for "PING". I updated TakBot to send PING and now the server returns "OK".
TakBot was getting disconnected after a couple minutes of idle time, so I figured the server had started checking pings. I enabled TakBot to send a Ping every 30 seconds and the server always returns "NOK".