[Request] support listener mode

[yeonns]

Feature Description

Now, euphony-collector supports speaker+listener mode, so data transmission is almost success.
To collect non-ideal data, euphony-collector should also support listener mode.

Let's say there are 2 devices

• device A: euphony-speaker (it sends "abc" to device B)
• device B: euphony-collector (it listens data from device A)
  • Case1: listen result can be "abc" -> it is success, so euphony-collector should save this result
  • Case2: listen result can be "ab" -> it is fail, so euphony-collector should discard this result

Then, euphony-collector should support feature like below

• euphony-collector can listen through another devices
• euphony-collector should receive data from other devices using another communication like bluetooth
• To check whether the received data is correct, euphony-collector should compare bluetooth result and euphony listen result
• After comparing the result, euphony-collector should decide whether to save the data or not

Decision

• Which communication is proper to send data? Is bluetooth the best?