how can we send a string over bluetooth

RE: how can we send a string over bluetooth

Sudeep R J — Fri, 20 Sep 2019 05:00:30 GMT

Hey RK,

I went through the ble uart program, in that there is some initialization with respect to UART and its pins and in the ble_nus_data_send function there is a call blcm_link_ctx_get(p_nus->p_link_ctx_storage, conn_handle, (void *) &p_client). So what does this function call and the program actually do?

I am not able to run it on my board as some RAMcode error is getting popped up and letting me to download and debug the program.

I want to send a string over bluetooth with the help of a characteristic and nothing else.

Kindly help me with the required information so that i can follow the program and make use of it.

Thanks & Regards

Sudeep R J

RE: how can we send a string over bluetooth

deepu — Wed, 01 Jul 2015 12:31:17 GMT

What i have understood is that in this function you cannot send more than a single character or 2,since the size of data is uint16(2 bytes).

If we want to send like"hello world" what has to be done

RE: how can we send a string over bluetooth

Milad — Sun, 28 Jun 2015 05:41:00 GMT

Hello There, Since I had a lot of difficulty with this I will try my best to explain everything I know in the easiest way I could :)

For Bluetooth Low Energy (BLE) communication you have to follow a certain set of rules and regulations. Mainly GAP (for detecting the device and the initial handshake between the device and the client/ cellphone ) and GATT (for a full back and forth communication between the device and the slave) Take a look at this:

learn.adafruit.com/.../gap

It will help if you get yourself familiar with the term "protocol stack."

www.youtube.com/watch

Once you are done there take a look at the Nordic tutorial :

devzone.nordicsemi.com/.../

At the end what is responsible for sending information is the following function:

ble_nus_string_send(&m_nus, data_array, index);

RE: how can we send a string over bluetooth

RK — Sun, 28 Jun 2015 04:10:45 GMT

There's a ble uart example in the dev kit which does exactly that- sends a string over bluetooth. You can use that as a starting point.