nRF52 Thread unicast mode ipaddr read and write

[Sunil vignesh]

Hi, I am currently working on nRF52 Thread v4.1.0 .

I am working on messaging transferring using coAP server an client . 

previously using CLI commands to detect the ipaddr , ipaddr add, ipaddr del

i want to set the  static ipaddr for my devices . and without using cli commands i need to configure ipaddr

and also read and write the ipaddr using the functions

so where could I get those functions

and

where otIp6IsAddressUnspecified is located

got like this

[Jørgen Holmefjord]

Hi,

You can reference the CLI source implementation in OpenThread, and use the same functions in your application to add/remove/detect IP addresses.

The sources are located in the OpenThread GitHub directory, e.g.: https://github.com/openthread/openthread/blob/c6a258e3a5bd90aa26d8245c435c0ae5797027f4/src/core/api/ip6_api.cpp. The SDK is delivered with pre-build libraries of OpenThread, without source files. You can clone and build the libraries on your local PC for the debugger to find the correct paths to the source files.

Best regards,
Jørgen

[Jørgen Holmefjord]

The addresses are assigned during different part of the initialization and/or network formation/attachment process. Some of the addresses are also dynamic, and may change during runtime if the Thread network change.

I would recommend you to read about the different IPv6 addressing types in the OpenThread documentation.

From your example output:

• fe80:0:0:0:3448:71b0:2147:7e41 is the Link-Local Address (assigned during CLI command "ifconfig up")
• fdde:ad00:beef:0:c1f7:fe04:39ec:79ad is the Mesh-Local EID address of the device. This address is not dependent on network topology, so this is the recommended address to use when you want to address a specific node.
• fdde:ad00:beef:0:0:ff:fe00:5c00 is the Routing Locator (RLOC) address of the node, which is dependent on the nodes placement in the network. If the node changes it state to child, or REED, this address will change. The address may also change due to other changes in the network.
• fdde:ad00:beef:0:0:ff:fe00:fc00 is the Anycast Locator for the network Leader node. If another node in the network takes over the role as leader, it will be assigned this address. The address will then disappear from this node (you can test this by adding another node to your network, it will have only the 3 above addresses)

[Sunil vignesh]

Hi Jørgen,

const char  * stat_ip = "FDDE::DEAD:BEEF:1002";
int aArgsLength = 10;

void ipaddrAdd()
{
    otError        error;
    otNetifAddress aAddress;

    otInstance * mInstance = thread_ot_instance_get();   
    otIp6AddressFromString(stat_ip[0], &aAddress.mAddress);
    aAddress.mPrefixLength = 64;
    aAddress.mPreferred    = true;
    aAddress.mValid        = true;
    error                  = otIp6AddUnicastAddress(mInstance, &aAddress);
}

added these lines and call the ipaddrAdd() 

under

thread_instance_init();
thread_coap_init();
thread_bsp_init();
ipaddrAdd();

output is

> 
> ipaddr
fdde:ad00:beef:0:0:ff:fe00:fc00
fdde:ad00:beef:0:0:ff:fe00:c000
0:0:0:0:0:0:0:0
fdde:ad00:beef:0:263c:9c02:6ca0:1fb2
fe80:0:0:0:a894:c859:4d2d:2302
Done
> 

[Jørgen Holmefjord]

Compiling your code gives warning about passing pointer from integer without cast to otIp6AddressFromString:

warning: passing argument 1 of 'otIp6AddressFromString' makes pointer from integer without a cast [-Wint-conversion]

Try passing stat_ip instead of stat_ip[0].

This gives me this output:

> ipaddr
fdde:ad00:beef:0:0:ff:fe00:fc00
fdde:ad00:beef:0:0:ff:fe00:dc00
fdde:0:0:0:0:dead:beef:1002
fdde:ad00:beef:0:fd05:418f:3d65:fc76
fe80:0:0:0:4078:a2fb:2e53:a22a
Done

[Sunil vignesh]

Hi Jørgen,

Yes it works