Hi Gabriel
Sorry for delay.
There is a method to limit bitrate, but it pretty complicated.
You must follow procedure decribed at "Controlling streaming process" section in http://blog.wmspanel.com/2015/12/rtsp-publish-control-setup.html
First, you will need to enable management API on you Nimble instance, as it described here:
https://wmspanel.com/nimble/api#toggler=0 and http://blog.wmspanel.com/p/nimble-streamer-configuration.html
In a brief: add line "management_listen_interfaces = 127.0.0.1" in /etc/nimble/nimble.conf file and you can send management requests to port 8082 from same host.
Then you should create some serivice that will periodically repeat following steps:
1) Get URL http://127.0.0.1:8082/manage/rtmp_status for a list of opened streams. Sample response:
[{"app":"live","streams":[{"strm":"one","publish_time":"1507804598","bandwidth":"630820","resolution":"424x240","vcodec":"avc1.42c01e","acodec":"mp4a.40.2","protocol":"RTMP"},{"strm":"two","publish_time":"1507804448","bandwidth":"125340","resolution":"1200x720","vcodec":"avc1.42c015","acodec":"mp4a.40.2","protocol":"ENCODER"}]}]
2) Get list of streams with ID's with http://127.0.0.1:8082/manage/publish_control/status . Sample response:
{"PublishControlStatus":[{"key":"1", "id":"ID_1", "ip":"192.168.1.1","stream":"live/one"}, {"key":"2", "id":"ID_2", "ip":"192.168.1.2","stream":"live/two"}]}
3) Match streams from rtmp_status with streams from publish_control/status and do POST list of clients you want to deny to
http://127.0.0.1:8082/manage/publish_control/deny . Sample request:
{"PublishControlDenyRequest":["2"]}