Hi Flow, thank you! As I wrote before it is not possible to enabled DEBUG mode in alpha6 (on Android).
In meantime I perform a positive test with public prosody server:
XMPPTCPConnectionConfiguration.XMPPTCPConnectionConfigurationBuilder conf = XMPPTCPConnectionConfiguration.builder();
conf.setHost("twattle.net");
conf.setPort(5222);
conf.setServiceName("twattle.net");
SASLAuthentication.blacklistSASLMechanism("SCRAM-SHA-1");
AndPassword("testtest", "testtest");
conf.setSecurityMode(ConnectionConfiguration.SecurityMode.enabled);
I still can not login to our openfire server with DIGEST-MD5.