sendFile() in TFTP sendFile() method does not work. It does not causes an error.
Looks like there is a bug in the communication.
I testet it with a sniffer.
1. write request looks ok
2. aknowlege from server
3. aknowlege from server
4. aknowlege from server
and so on.
I replaced the lib with version 1.1 and it works now.
NET-68 [net] TFTPClient's send file discards last ack