A rule of thumb do not use BTLE for anything more than simple signaling requiring less than ~17kbps.
This means sending voice or transferring large data files is really not practical. Also, for the iPhone the latency could be around 37.5ms (that appears to be the smallest connection interval that is officially supported although I have seen an iPad connect at 20ms)
Consider UART interface, 19200 bps is the max limitation.
refer to the original here.
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