AWG50000 Python communication

import socket
from struct import pack
from time import sleep
 
def write(socket, cmd:str)->None:
    socket.sendall(bytes(cmd + '\n', 'ASCII'))
    sleep(.1)
 
def read(scoket)->str:
    MESSAGE_ENDS_WITH = '\r\n'
    received = ' '
    while received[-len(MESSAGE_ENDS_WITH):] != MESSAGE_ENDS_WITH:
        try:
            received += socket.recv(1024).decode()
        except TimeoutError:
            received = ''
            break
    received = received[1:]
    received = received.rstrip(MESSAGE_ENDS_WITH)
    sleep(.1)
    return received
 
socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket.connect(('192.168.0.69', 1111))
socket.settimeout(1)
 
write(socket, '*CLS') # Clear error buffer.
 
write(socket, '*IDN?')
print(read(socket)) # 'TEKTRONIX,AWG...'
 
samples = [1,2,3] # This is my waveform.
 
# Following line works fine, the new waveform shows up in the AWG with the right name and number of samples:
write(socket, f'WLISt:WAVeform:NEW "deleteme", {len(samples)}, INT')
write(socket,'SYST:ERR?')
print(read(socket)) # '0,"No error"'
 
send_this = bytes(f'WLISt:WAVeform:DATA "deleteme",', 'ASCII')
send_this += b''.join([pack('<h', sample) for sample in samples])
send_this += b'\n'
print(f'Will send: {send_this}') # Will send: b'WLISt:WAVeform:DATA "deleteme",\x01\x00\x00\x00\x02\x00\x00\x00\x03\x00\x00\x00\n'
socket.sendall(send_this)
sleep(.1)
 
write(socket,'SYST:ERR?')
print(read(socket)) # -109,"Missing parameter; Unexpected termination detected - WLISt:WAVeform:DATA ""deleteme"","
 
# The waveform data was not updated in the AWG, it has only [0,0,0]