[chaley]

Originally Posted by Steve_Haley

Upon further examination I can see that it does report an error later on.

Spoiler:

SMART_DEV ( 142.34: 0.000) _receive_from_client protocol error -- empty json string
SMART_DEV ( 142.36: 0.000) _call_client other exception
Traceback (most recent call last):
File "site-packages\calibre\devices\smart_device_app\driver.p y", line 615, in _call_client
File "site-packages\calibre\devices\smart_device_app\driver.p y", line 657, in _receive_from_client
ControlError: Device responded with incorrect information

That is probably CC disconnecting. I made a mistake when I designed the protocol, not including an explicit disconnect sequence. Instead, one end or the other simply closes the socket. The connection partner sees that as a network error and then closes its side of the connection.