notifyAll method
Envia message por todos os canais ativos; retorna o resultado de cada um.
Implementation
Future<List<ChannelResult>> notifyAll(NotificationMessage message) async {
final results = <ChannelResult>[];
for (final c in active) {
try {
await c.send(message);
results.add(ChannelResult(c.name, true));
} catch (e) {
results.add(ChannelResult(c.name, false, '$e'));
}
}
return results;
}