My Assumptions
- Coordinator module can able to receive data from 4 nodes.
- Your Arduino code is processing the data received from the coordinator.
- Once the processing is done, you need to post it to some server program.
What kind of server program running in the server?
Do you have any restriction in Server program not to receive lengthy string.
Did you check whether your "Complete Data" holds all what you wanted? Serial print can identify that.