NetworkQualityChangedHandler

"qualityInfoJson": {
  "quality": int,         one of: NORMAL=1, MEDIUM=2, POOR=3, NETWORK_PROBLEM=4, RECONNECTING=5
  "tx": int,              percentage of up packets lost
  "rx": int,              percentage of down packets lost
  "loss": {
    "tx": int,            percentage of up packets lost
    "rx": int,            percentage of down packets lost
  },
  "jitter": {
    "audio": {
      "tx": int,          audio up jitter in milliseconds
      "rx": int           audio down jitter in milliseconds
    },
    "video": {
      "tx": int,          video up jitter in milliseconds
      "rx": int           video down jitter in milliseconds
    },
  },
  "connection": {
    "protocol": string,   one of: UDP, TCP, Unknown
    "candidate": string,  one of: Relay, Host, Srflx, Prflx, Unknown
  },
  "peer": string,         one of: Server, User, Unknown
}