how to send the float to string over ble_nus

RE: how to send the float to string over ble_nus

awneil — Tue, 11 Jun 2019 12:36:09 GMT

As Jørgen Holmefjord said in your duplicate thread,

[quote userid="14926" url="~/f/nordic-q-a/48350/issue-in-sending-the-float-value-in-ble_nus_send/192061"]If you do not get any value, there is most likely some other issue[/quote]

devzone.nordicsemi.com/.../192061

So perhaps you should just continue in that thread.

RE: how to send the float to string over ble_nus

ps_anu — Tue, 11 Jun 2019 09:56:28 GMT

no in nRF toolbox

RE: how to send the float to string over ble_nus

awneil — Tue, 11 Jun 2019 08:52:25 GMT

[quote userid="74848" url="~/f/nordic-q-a/48419/how-to-send-the-float-to-string-over-ble_nus/191953"]nRF app uart[/quote]

You mean this:

https://play.google.com/store/apps/details?id=com.nordicsemi.nrfUARTv2&hl=en_GB

RE: how to send the float to string over ble_nus

awneil — Tue, 11 Jun 2019 08:49:52 GMT

[quote userid="74848" url="~/f/nordic-q-a/48419/how-to-send-the-float-to-string-over-ble_nus/191958"]incompatible type of argument 2 in ble_nus_send[/quote]

That's a standard 'C' language error - nothing specific to Nordic or BLE.

See your 'C' textbook for the 'C' language rules about types and their "compatibility" - and how to use a so-called "cast" to get around them ...

RE: how to send the float to string over ble_nus

ps_anu — Tue, 11 Jun 2019 08:39:40 GMT

even i have tried to send the raw bytes of the float value . i am getting error , incompatible type of argument 2 in ble_nus_send()

RE: how to send the float to string over ble_nus

ps_anu — Tue, 11 Jun 2019 08:21:33 GMT

but i want to send the data over ble in nRF app uart .

RE: how to send the float to string over ble_nus

awneil — Tue, 11 Jun 2019 08:06:04 GMT

[quote userid="74848" url="~/f/nordic-q-a/48419/how-to-send-the-float-to-string-over-ble_nus"]for that i need to convert into string right[/quote]

Not necessarily.

ble_nus_data_send() just sends bytes - it neither knows nor cares what those bytes represent.

So you could just send the raw bytes of the float value.

The downside of that, of course, is that you won't be able to just view it on a plain terminal - you will need to software on the receiving end which does understand the format, and can re-assemble those bytes into a float value (and, if required, display them in a meaningful, human-readable form).

This applies to any form of communication - not specific to Nordic or BLE.

[quote userid="74848" url="~/f/nordic-q-a/48419/how-to-send-the-float-to-string-over-ble_nus"] i have done i have converted into string[/quote]

This:

length1 = sprintf(str,"%.2f", tempC);

Have you checked that the conversion is actually working?

The following code is still using the length of the original float - not the length of your converted string!

             ble_nus_data_send(&m_nus,str,sizeof(tempC), m_conn_handle);
             NRF_LOG_INFO("Temperature: " "%s%d.%01d", NRF_LOG_FLOAT(tempC));