performAction method
Implementation
void performAction(String channelName,
{String? action, Map? channelParams, Map? actionParams}) {
final channelId = encodeChannelId(channelName, channelParams);
actionParams ??= {};
actionParams['action'] = action;
_send({
'identifier': channelId,
'command': 'message',
'data': jsonEncode(actionParams)
});
}