Opening a saved project in Scratch breaks the handler

[tompreston]

When a saved project is opened the socket does not hang and

received something ['']

is printed over and over.

Fix: kill the scratch hander (ctrl+z then kill %%) and restart it.

[tompreston]

Possible fix: check for empty string a couple of times in a row. Close/Open socket. Retry x 5.

[tompreston]

So after opening a project and watching the Scratch Handler restart the Scratch Handler fails to receive data from the Recv-Q (MESH (Scratch) is localhost:42001):

$ netstat -t
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp      187      0 localhost:56121         localhost:42001         ESTABLISHED
tcp        0      0 localhost:42001         localhost:56121         ESTABLISHED

Same results after commenting out line 98. It looks like an issue with the way I use the socket to talk to Scratch. Can anyone shed some light on this?

[mikajones]

It appears that the when a saved project is opened there is a decode error with the first line

Just reading the socket with
while True:
data = s.recv(BUFFER_SIZE).decode('utf-8')
print (data)

Produces a decode error
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 3: invalid start byte

Without the decode the socket is returning
b'\x00\x00\x00\x80sensor-update "piface-output3" 0 "piface-output4" 1 "piface-output5" 1 "piface-output6" 0 "piface-output7" 0 "piface-output8" 1 '

I am not sure how to handle this yet

[mikajones]

If you change the read socket line to the line bellow it will work when you open a saved project

data = scratch_socket.recv(BUFFER_SIZE).decode('utf-8','replace')