Methods and systems for transmission of arbitrary data via bluetooth HFP audio connections with low latency

A method comprising:

• receiving a bit pattern that is representative of a binary data sequence;
• generating a multi-bit data byte sequence that is representative of the bit pattern, wherein generating the multi-bit data byte sequence comprises, for each bit in the bit pattern:
• (i) outputting a multi-bit data byte that is larger than a current byte-sequencer reference data byte when the current bit in the bit pattern is of a first value, (ii) outputting a multi-bit data byte that is smaller than the current byte-sequencer reference data byte when the current bit in the bit pattern is of a second value, and (iii) updating the byte-sequencer reference data byte based on the currently output multi-bit data byte;
• and
• providing the generated multi-bit data byte sequence to an audio codec that is configured to receive a sequence of multi-bit data bytes and responsively, for each received multi-bit data byte:
• (i) output, via a Bluetooth data link, a single bit whose value is indicative of whether the current received multi-bit data byte is larger or smaller than a current audio-codec reference data byte and (ii) update the current audio-codec reference data byte based on the current received multi-bit data byte.