unsubscribeSubscriptionList method
Unsubscribe from a subscription list. Note that user properties are set on a per message basis not a per subscription basis, if you wish to send user properties then set them on the first subscription in the list.
Implementation
void unsubscribeSubscriptionList(List<MqttSubscription>? subscriptions) {
if (subscriptions == null) {
throw ArgumentError(
'MqttSubscriptionManager::unsubscribeSubscriptionList - subscription list is null');
}
final unsubscribeMsg = MqttUnsubscribeMessage()
.withMessageIdentifier(messageIdentifierDispenser.nextMessageIdentifier)
.fromSubscriptionList(subscriptions)
.withUserProperties(subscriptions.first.userProperties);
_connectionHandler.sendMessage(unsubscribeMsg);
pendingUnsubscriptions[unsubscribeMsg.variableHeader.messageIdentifier] =
subscriptions;
}