17:29:05.652 [Tx] AT+QIOPEN="TCP","127.0.0.1",3000r
17:29:05.672 [Rx] rnOKrnrnCONNECT OKrn
17:29:07.699 [Tx] AT+SEND=1r
17:29:07.718 [Rx] >
17:29:08.603 [Tx] A
17:29:08.647 [Rx] rnSEND OKrn
17:29:09.446 [Rx] CLOSED

Connection reset by peer error again
Traceback (most recent call last):
  File "./server.py", line 22, in <module>
    data = r"{}".format(conn.recv(1024))
ConnectionResetError: [Errno 104] Connection reset by peer

$ python client.py data
Received: b'$E0A0:8Br$E0FFr'