Can not store the received uplinks to MongoDB.
Why cannot receive the received uplinks to MongoDB? Is it because of the wrong configuration? My configuration is as follows.

Usually the port is 27017
Yeah. You are right. But I actually configured it to 28017. Are there any other issues?
Also I am more used to test/xxxx notation than xxx/test
debug.log file is your best friend here. You can send it me and I'll have a look on what's going on in the server.
Oh, and I am not really sure about ascii text payload, never used it before. But in the result you can have an invalid json/bson for mongo connector input.