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CC3235MODASF: TCP Windows Update for flow control

hiroki-okazaki
Intellectual 370 points
Part Number: CC3235MODASF


Tool/software:

Hello.

I develop our puroduct implemeted CC3235MODASF.

When our product communicates TCP packet with peer device,

"TCP Window Update" is sent sometime.

What is trriger timing to send for "TCP Window Update" ?

Can I stop to send "TCP Window Update" ?

Please find attched Wireshark log image.

Our product: 192.168.0.1

Peer device :192.168.0.5

Additional,

because wireshark adds TCP Window update to log,

my quetion is changed.

The TCP sequence is below.

Modbus/TCP: Our product -> peer device

TCP ACK: Our product <- peer device

TCP ACK: Our product -> peer device

Why CC3235MODASF send to ACK for this sequence?


Best regards,

Okazaki

  • 0
    TI__Guru 64555 points

    Hi,

    Hard to tell just from this capture.

    Do you have the full sniffer? is this sniffer capture is an air sniffer?

    I am asking because the reason I am thinking of is related to not getting ACK frame on Wi-Fi layer from the peer device so your device simply resends the Wi-Fi frame which happens to be the TCP ACK.

    Regards,

    Shlomi