Update build.gradle #44
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Use 1.2.1 instead to avoid following error:
MqttConnectOptions.setUserName in 1.2.0 has a null/empty check:
```
public void setUserName(String userName) {
if ((userName != null) && (userName.trim().equals(""))) {
throw new IllegalArgumentException();
}
this.userName = userName;
}
```
while the connect method in MqttClient will give "" as default value for username. And result to an IllegalArgumentException
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Use 1.2.1 instead to avoid following error:
MqttConnectOptions.setUserName in 1.2.0 has a empty string check(removed by commit ):
while the
connectmethod inMqttClientwill give "" as default value for username:connOpts.setUserName(options.hasKey("username") ? options.getString("username") : "");Which result to an
IllegalArgumentException