How to set TCP Port Address in TCP example.

RE: How to set TCP Port Address in TCP example.

Niranjan Pradhan — Thu, 26 Sep 2019 05:52:09 GMT

Hi Vidar,

As per your suggestion, I have made the changes. I have followed below steps to test the TCP_Client app with a laptop as a server.

Steps

Run Server python script in the laptop
Program the TCP_client example in nRF52840 DK.
Connect the DK to laptop using "echo "connect 00:C6:11:36:D6:50 1" > /sys/kernel/debug/bluetooth/6lowpan_control" command.
Assign Global ip to bt0 interface in laptop "ifconfig bt0 add 2005::5613:79ff:fe7a:5676/64". (Scope:Global)

Below is the output of ifconfig bt0

bt0 Link encap:UNSPEC HWaddr 54-13-79-FF-FE-7A-56-76-00-00-00-00-00-00-00-00

inet6 addr: fe80::5613:79ff:fe7a:5676/64 Scope:Link

inet6 addr: 2005::5613:79ff:fe7a:5676/64 Scope:Global

UP POINTOPOINT RUNNING MULTICAST MTU:1280 Metric:1

RX packets:3 errors:0 dropped:0 overruns:0 frame:0

TX packets:9 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1

RX bytes:65 (65.0 B) TX bytes:338 (338.0 B)

But not able to tranfer Ping and Pong data.

static const ip6_addr_t m_remote_addr =
{
    .addr =
    {HTONL(0xfe800000),
    0x00000000,
    HTONL(0x561379FF),
    HTONL(0xFE7A5676)}
};

If I use "fe80::5613:79ff:fe7a:5676" (Scope:Link) as value for m_remote_addr in the source code and follow all the steps except Step 3. Then able to transfer Ping and Pong data.

Could you please confirm which IPv6 (Link or Global) need to use in source code?

RE: How to set TCP Port Address in TCP example.

Vidar Berg — Mon, 23 Sep 2019 12:18:12 GMT

Please try with this address:

static const ip6_addr_t m_remote_addr =
{
.addr =
{HTONL(0x20050000),
0x00000000,
HTONL(0x561379FF),
HTONL(0xFE7A5676)}
};

It should correspond to 2005::5613:79ff:fe7a:5676 if I typed it in correctly. You may use wireshark to confirm.

edit: just want to point out that ipv6 over BT is quite bit complicated and not particularly beginner friendly in my opinion. Depending on your use case it may be better to consider alternatives if possible. Maybe use regular BLE instead.

RE: How to set TCP Port Address in TCP example.

Niranjan Pradhan — Fri, 20 Sep 2019 10:35:35 GMT

Hi Awneil,

Example: https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/iot_sdk_app_lwip_tcp.html

IDE: SEGGER

Thank You

RE: How to set TCP Port Address in TCP example.

awneil — Fri, 20 Sep 2019 10:26:26 GMT

Which example, exactly, are you trying?

and what IDE / toolchain are you using?