Anyone knows if it's possible to transmit raw data through jack plug of an iPhone/iPad?

I have a dummy hardware that have a jack socket and a simple protocol. I want to send/receive serial data from this hardware on my iPhone/iPad, but I don't know if this is possible, because is a very low level protocol. I also have bluetooth, but is not supported by apple, so I decided to investigate this option, with the jack plug. I called Apple support but they couln'd help me and they told me to ask here. Thanks!

There are devices, like credit card readers, heart rate monitors and such that can do this.  I am no expert by any means, but those devices supposedly work as a Frequency Shift Keying modem, sending data at a pretty low baud rate to the software on the iOS device.
So it is doable, but my understanding it takes a combination of a hardware device to transmit the data via the headphone jack, and then a specific iOS app designed to capture and read that data.
Definitely non-trivial.
P.S. the modem itself is commercially available, example -
https://www.sparkfun.com/products/10331

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