Walter: #ESP32-S3 board with LTE-M, NB-IoT and GPS
https://www.crowdsupply.com/dptechnics/walter/updates/our-crowdfunding-campaign-is-live
@lupyuen am I wrong in my understanding that 1Mbits would be enough for low-quality audio streaming?
Theoretically this can be used for low-bandwidth voice calls? (Matrix or Mumble perhaps?)
@pak0st Yep theoretically LTE-M with 1Mbps is sufficient for Audio Streaming / Voice Calls.
But it also depends on the Quality of Service imposed by the Mobile Operator: Dropped Packet Rate, Latency, etc
For Telcos: They will probably use Voice over LTE (VoLTE) on top of LTE-M, which has better QoS:
https://iot.telenor.com/iot-insights/lte-m-vs-nb-iot-guide-differences/
FYI VoLTE requires only 48 kbps to 128 kbps of bandwidth:
