As we’ve noted in the past, the upload volume for a RS4D is typically within a range of 8-14 GB/mo. That’s not a guess, that’s based on our calculations and verified by measurements we’ve made here in the office and in the field. If you are seeing something larger than that, then there must be additional traffic being included in the usage computations for that connection. This may have happened as a result of:
- Direct data link(s) from the outside via e.g. SWARM or FileZilla, or another Seedlink/wave server client
- UDP data forwarding from the Shake to an outside address
- Another program using the Pi’s uplink
Here are the calculations for the Shake 4D’s data forwarding usage. These have been tested and confirmed:
Max data / second:
= number of bytes for headers + number of bytes for data points
chn = total number of channels
dpf = data packet frequency, i.e., number of data packets / second
dph = data packet header size
sps = sample rate, as samples / second
bdp = max bytes / data point
= chn * dpf * dph + chn * sps * bdp
= 4 * 4 * 80 + 4 * 100 * 11
= 1280 + 4400
= 5680 bytes / second
Max data per day:
= 5680 * 86400
= 490752000 bytes
= 468 MB
Average data per day: (assuming 5 bytes / data point):
= 270MB / day / 100Hz 4D
Max data per month:
468 MB * 30 days = 14040 MB/mo
Average data per month:
270 MB * 30 days = 8100 MB/mo