Snprintf - Data Formatting Question/Help

[RWB]

I need to format a Payload before I send it out via a UDP Broadcast.

I’ve used the Snprintf function before in the past with good success but on this new project I’m feeding the Snprintf function with data being held in a char array and I think it needs formatted maybe to work correctly.

The Array I’m pulling Data from is shown below.

Here is a note from the Library creator about pulling the data stored in this array which is in char format and not numbers or floats.

I’m creating a formatted Payload using code like shown below:

I’m wondering if I can just use the snprintf function and the %s formatting code to just use the Char data stored in the Array without needing to convert the data using the ATOI() & ATOF() functions? I do not need to do any math on the data before sending it out so not sure if the conversion from Char to Number is needed if I only need to send it out via a UDP Broadcast message.

So I’m thinking of formatting the payload using the %s for data stored in the Char format but I’m not sure just yet. Wanted some professional feedback on this if possible.

Thanks!

[ScruffR]

@RWB

I’m wondering if I can just use the snprintf function and the %s formatting code to just use the Char data stored in the Array without needing to convert the data using the ATOI() & ATOF() functions?

Yes, you can. But a simple try would have provided that answer too

However, for your massive snprintf() statement in your screenshot above if you were sending that via UDP I'd rather push the data into a struct and transfer that binary.

[RWB]

Great! Thanks for the confirmation.

I didn’t have time to test it before going to bed but wanted some feedback as to if it was recommended or not. I had a good feeling it would work.

[RWB]

It worked perfectly just inserting the Char data using %s

Using a Photon and Control Everythings Wiznet Ethernet board I am able to UDP Broadcast the system’s status data.

This is the first time I have ever needed to use Ethernet & UDP so it was a learning experience.