Valid JSON config file, uploading to board
Config file length (words) = 1716
Config file length (bytes) = 6862
Remainder = 2
Padding added =  [0, 0]
Config file length with padding (bytes) = 6864
CRC-32 = 0x580751a8
Timeout waiting for traffic, retrying...
Timed-out waiting for traffic
resending last packet
Resending packet WRQ packet: filename = config mode = octet on sessions <tftpy.TftpStates.TftpStateSentWRQ object at 0xb6587690>
Timeout waiting for traffic, retrying...
Timed-out waiting for traffic
resending last packet
Resending packet WRQ packet: filename = config mode = octet on sessions <tftpy.TftpStates.TftpStateSentWRQ object at 0xb6587690>
Timeout waiting for traffic, retrying...
Timed-out waiting for traffic
Traceback (most recent call last):
  File "/home/pi/.local/lib/python3.7/site-packages/tftpy/TftpContexts.py", line 171, in cycle
    (buffer, (raddress, rport)) = self.sock.recvfrom(MAX_BLKSIZE)
socket.timeout: timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "upload_config.py", line 72, in <module>
    client.upload("config", "/tmp/config.txt", timeout=30)
  File "/home/pi/.local/lib/python3.7/site-packages/tftpy/TftpClient.py", line 101, in upload
    self.context.start()
  File "/home/pi/.local/lib/python3.7/site-packages/tftpy/TftpContexts.py", line 325, in start
    self.cycle()
  File "/home/pi/.local/lib/python3.7/site-packages/tftpy/TftpContexts.py", line 174, in cycle
    raise TftpTimeout("Timed-out waiting for traffic")
tftpy.TftpShared.TftpTimeout: Timed-out waiting for traffic