Detection of transmission medium state for power delivery

A first system comprising:

• a memory to store instructions;
• a processor coupled to the memory, the processor to execute the instructions;
• an Input/Output (I/O) port to couple the first system to a second system, and to allow the processor to communicate with the second system via the I/O port;
• an Analog-to-Digital Converter (ADC) to detect a first voltage level of a reference current received from the second system, wherein the second system is to transmit the reference current at a second voltage level;
• and
• a wireless interface to allow the processor to communicate with another system,
• wherein the processor is to cause transmission of a value of the first voltage level to the second system, to allow the second system to transmit power to the first system, wherein a level of the power transmitted from the second system to the first system is based at least in part on a difference between the first voltage level and the second voltage level.

One or more non-transitory computer-readable storage media to store instructions that, when executed by a processor, cause the processor to:

• transmit a reference current at a first voltage from a first apparatus to a second apparatus, wherein the processor and the computer-readable storage media are included in the first apparatus;
• receive, from the second apparatus, a value of a second voltage at which the reference current was received at the second apparatus;
• determine a difference between the first voltage and the second voltage;
• and
• transmit power from the first apparatus to the second apparatus, based on least in part on the difference between the first voltage and the second voltage.