isUpgradeToVideoModeRecvOnly method
Returns true if account with specified id has 'upgradeToVideo' set to 'RecvOnly'
Implementation
@override
bool isUpgradeToVideoModeRecvOnly(String uri) {
int index = _accounts.indexWhere((a) => a.uri==uri);
return (index == -1) || (_accounts[index].upgradeToVideo==null)||
(_accounts[index].upgradeToVideo==UpgradeToVideoMode.RecvOnly);
}