Serial LTE Modem - How to send binary data using AT#XSEND?

[Slawoj]

Hello,

What is the way to send binary or JSON data using AT#XSEND socket command in the new SDKs (>1.60)?
Former version of this command contained additional parameter <datatype> which allowed to switch between data type.
It seems current version does not support this parameter, only string format with quotes is allowed.
Is there another way?

We have Serial LTE modem app from 2021-10-20, SDK v1.7.0, reprogramming modules is not an option due to customer field test.

Thanks,
Slawek

[Hakon]

Hello,

you probably need to send the JSON object or binary data as a string, and then parse it on the receiving side. There are some functions that can be useful in the cJSON library.

[Slawoj]

Hello Hakon,
thanks for answer.

In our case, converting data to string and reconverting on the other side is not a possible solution.
Devices will communicate with the dedicated server in the internet which have already running application and serve thousands of devices. Any modifications of protocol are not allowed.

Some another option?

[Hakon]

You should run SLM in data mode. And then run the AT#XSEND without any parameter. You can read more about how it's done here.