subscribeTo method
Implementation
void subscribeTo(String channel, {MqttQos mqttQos = MqttQos.atLeastOnce}) {
client!.subscribe(channel, mqttQos);
}
void subscribeTo(String channel, {MqttQos mqttQos = MqttQos.atLeastOnce}) {
client!.subscribe(channel, mqttQos);
}