My application has 2 clients (node111 and node222) configured as follows:
APP1
intent.putExtra(SymmetricService.INTENTKEY_EXTERNAL_ID, "node111");
intent.putExtra(SymmetricService.INTENTKEY_NODE_GROUP_ID, "clientM");
APP2
intent.putExtra(SymmetricService.INTENTKEY_EXTERNAL_ID, "node222");
intent.putExtra(SymmetricService.INTENTKEY_NODE_GROUP_ID, "clientM");
You have to register both nodes on the server as follows: symadmin --engine databaseName open-registration clientM node111 and symadmin --engine databaseName open-registration clientM node222