Python Forum

I'm playing with scapy. I'm trying to forge JUST PSH/ACK and ACK packets in sequence
I coded two tools: A which sends PSH/ACK packets and then sniffs the result ACK, writing the sequence in a file to use it later

.....
bitack = random.randrange(1,656787969)
bitseq = random.randrange(1,4294967295)
if os.path.exists('test.txt'):
    with open('test.txt','r') as f:
       bitseq = int(f.read())

else:
    with open('test.txt','w') as f:
        f.write(str(bitseq))
.....    
text = "Ok"
TSval = int(time.time())
TSecr = TSval
acker = IP(src="127.0.0.1",dst=destinazione"127.0.0.1")/TCP(sport=88,dport=8888, flags="PA", seq=bitseq, ack=bitack, options=[('Timestamp', (TSval, TSecr))])/text
send(acker)
.....
rx = sniff(filter="host 127.0.0.1 and src port 8888", iface="lo", count=1)
seqcc = rx[0].getlayer(TCP).seq
ackcc = rx[0].getlayer(TCP).ack
with open('test.txt','w') as f:
    f.write(str(ackcc))           
    print("SEQFINALE=", ackcc)

B: which sends ACK packets AFTER it sniffs a PSH/ACK packet from A. I know the ack packets contain text ( in this example the same ), but this is what I want

....
rx = sniff(filter="host 127.0.0.1 and dst port 8888", iface="lo", count=1)
seqcc = rx[0].getlayer(TCP).seq
print("seq:", seqcc)
ackcc = rx[0].getlayer(TCP).ack
print("ack:", ackcc)
var = rx[0][Raw].load.decode(encoding='utf-8', errors='ignore')
acker = IP(src="127.0.0.1",dst="127.0.0.1")/TCP(sport=8888,dport=88, flags="A", seq=ackcc, ack=seqcc + int(len(var)), options=[('Timestamp', (TSval, TSecr))])/var
send(acker)
.....

Everything works fine expect that wireshark gives some warning and I don't understand why:
The first two packets are perfect:

https://imgur.com/a/LZnwXdS


Is there any issue in how I handle the sequence number/ ack number?
This makes me crazy

Solved. The issue was how I handled the sequence number/ ack number