transfer data with coap

Mark Felberg

Guru 19990 points

Other Parts Discussed in Thread: MIO

Hi, I have implemented in my work code data to read on the CoAP and so far everything works. Now I would like to save this data on a cloud that works with CoAP. Can I do this with the cc26xx-web-demo? I have the url of the cloud, how can I implement it in the code?

over 6 years ago

0 YiKai Chen over 6 years ago

Guru 735455 points

You can refer to er-example-client.c to do it.

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

Where can I enter the cloud url?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

/* FIXME: This server address is hard-coded for Cooja and link-local for unconnected border router. */
#define SERVER_NODE(ipaddr) uip_ip6addr(ipaddr, 0xfe80, 0, 0, 0, 0x0212, 0x7402, 0x0002, 0x0202) /* cooja2 */

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

Then: #define SERVER_NODE "coap://[name cloud]:5683" ?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

Would you please study the code a bit at least. You shall replace "0xfe80, 0, 0, 0, 0x0212, 0x7402, 0x0002, 0x0202" with IPv6 address of your COAP server.

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

In coap-server.c situated in cc26xx-web-demo folder, who is the client?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

There’s no COAP client in CC26xx-demo-web.

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

Ok, how function er-example-client and er-example-server?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

I don’t try it by myself. You have to test it by yourself.

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

Hi Yikai, I have a question for you. But the port of CoAP 5683, Can I change or not?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

Yes, you can change it.

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

Ok I change it, then with Coap of cc26xx-web-demo, I can't to connect with cloud?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

I don’t see the relation why changing port makes connect to cloud fail.

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

I know! Now I should to write a code for CoAP Client and I add the url of server and the keystore. Can I add this information on Contiki?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

Why not.

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

I know that Contiki OS uses Erbium CoAP. I think all the CoAP information I have to see in the apps / er-coap folder. Is there any code for Keystore where it is defined?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

What do you mean Keystore here?

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

I need to create a coap-client code to connect to the cloud server. The cloud gave me access parameters and keys to access. Can I add access keys with Erbium Coap?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

I am not familiar with this so cannot help.

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

Instead of Ipv6 for #define server, can I add a simply url (e.g www.myexample.com) ?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

I don’t think so.

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

Instead, if I want to define a new url for connect with cloud, Can I do "URI uri = new URI ("coap://[example:5684]")" ?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

It should be no problem.

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

Hi Yikai, the server node it's define "static uip_ipaddr_t server_ipaddr[1]; /* holds the server ip address */", uip_ipaddr_t_server How Can I define in Contiki OS?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

It is "#define SERVER_NODE(ipaddr) uip_ip6addr(ipaddr, 0xfe80, 0, 0, 0, 0x0212, 0x7402, 0x0002, 0x0202) /* cooja2 */"

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

To connect to a CoAP cloud that would be the server; do I need the example-server.c code?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

I think you don't need example-server.c code in this case.

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

Ok, for to implement the state temperature on coapclient, I add the #define batmon-sensor.h and &batmon_sensor for passage of temperature.

It's ok?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

What do you mean to implement the state temperature on coap client?

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

I want to forward the temperature status with the POST method on the CoAP, I entered the batmon-sensor.h library and added & batmon_sensor.

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

We don't use COAP in this way. We usually implement a COAP server on device with temperature reading and any application wanted the information can use COAP client to get data.

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

But usually, Can I do this step without a code server?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

You can use other protocol like UDP to transmit data directly.

0 YiKai Chen over 6 years ago

Guru 735455 points

It might be caused by your coap response length too long.

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

Hi Yikai, I have a question for you. I should to implement the library of DTLS on Contiki OS for my device. Should I to refer the libcoap or tinyDTLS?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

Try to refer to sunmaysky.blogspot.tw/.../how-to-build-dtls-example-for.html

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

The library of tinyDTLS, Can I to implement on example-client-coap?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

Yes, I think it’s no problem.

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

How function DTLS Coap in 6lbr demo?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

You have to try it by yourself.

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

I following the step on your blog. I arrive at the step of download tinydtls on VMware, but when I digit sudo make...I read fatal error "#include "dtls_config.h" no such file or directory.

What is the problem?

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

Can you specify which part you are talking about?

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

I digit: sudo make clean e sudo make target and I see error "# include "dtls_config.h" no such file or directory", the same when I digit sudo ./configure e sudo make on VMware player

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

Do you mean you have problem to build tinydtls-0.8.2?

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

Yes, I build the file.bin and resolve the problem on Contiki folder so:

cd contiki/apps/tinydtls
sudo autoreconf
sudo ./configure

But I have the problem with VMware Player, when I digit sudo ./configure and make. I see sha2/Makefile cannot find

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

In the blog, I mentioned “Download tinyDTLS from sourceforge.net/.../ and untar it to your home folder in Contiki VMPlayer...” Do you do this?

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

Yes

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

I don’t think you do it correctly. It’s a tar file to download and untar. What do you see after you untar it?

0 Mark Felberg over 6 years ago in reply to YiKai Chen

Guru 19990 points

1) Download tinyDTLS from the website

2) sudo tar zxvf tinydtls-0.8.2

2) Go to the folder tinydtls-0.8.2

3) Do ./configure and make

At this point I see "error: cannot find input file: sha2/Makefile.in"

0 YiKai Chen over 6 years ago in reply to Mark Felberg

Guru 735455 points

Do you do this in InstantContiki?

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