(11-03-2021, 11:18 AM)Jens Noritzsch Wrote: Hm, we are talking about smartphone sensors, aren't we? There is a difference between the capabilities of built-in sensors and that what the API provides us. The rates in https://phyphox.org/sensordb/ are upper limits and I could not find anything (common) avove 500 Hz…

(11-05-2021, 01:59 AM)Sebastian Staacks Wrote: I have tracked the problem down to an unexpected (if not buggy) behavior of requests: It form-encodes the pipe "|" no matter how you pass it to get(). The docs (https://docs.python-requests.org/en/master/user/quickstart/#more-complicated-post-requests) specifically say that it should not encode it if you pass the url or the parameters as a string, but it still does so and phyphox at the other end does not decode the form encoding (why should it - it's not an endpoint for a HTML form and it still is a valid HTTP request).

So, after searching for ways to circumvent this problem, I ended up using urllib3 instead and this seems to work:

Code:

#MIDI configuration
M_OUTPUT = "Midi Through:Midi Through Port-0 14:0"
M_CHANNEL = 0
M_CONTROLS = [1, 2, 3, 4] #You can send on different CC channels
# M_CONTROLS = [70]

#phyphox configuration
PP_ADDRESS = "http://192.168.2.194:8080"
PP_CHANNELS = ["accX", "accY", "accZ", "acc_time"] #If using different CC channels, define multiple phyphox buffers
# PP_CHANNELS = ["accY"]

from urllib.request import urlopen
import json
import time
import numpy

value_temp = 0

time_update = 0
count = 0
while True:
    if count == 0:
        PP_CHANNELS_def = ["acc_time=full","accX=full","accY=full","accZ=full"]
    else:
        PP_CHANNELS_def = ["acc_time=" + str(time_update), "accX=" + str(time_update) + "|acc_time","accY=" + str(time_update) + "|acc_time","accZ=" + str(time_update) + "|acc_time"] #If using different CC channels, define multiple phyphox buffers

    url = PP_ADDRESS + "/get?" + "&".join(PP_CHANNELS_def)

    response = urlopen(url).read()
    data = json.loads(response)

    time.sleep(0.04)
    count = count + 1
    time_update = count * 0.04;

    # Uncomment to send pitch bend
    time_value = numpy.array(data["buffer"]["acc_time"]["buffer"])
    value_x = numpy.array(data["buffer"]["accX"]["buffer"])
    value_y = numpy.array(data["buffer"]["accY"]["buffer"])
    value_z = numpy.array(data["buffer"]["accZ"]["buffer"])

However, there is one other thing you probably want to change: You should not use "time_update" in your request, but the latest value you received in data["buffer"]["acc_time"]["buffer"] in your previous request (so, the last value in "time_value"). Otherwise, your time_update will eventually get out of sync with phyphox (well, it will probably start out of sync as you cannot start the script and the measurement at exactly the same time) and you will either get duplicates (imagine your time_update is 10 seconds behind and phyphox will send you everything from the last 10 seconds every time) or miss values (imagine it is a few milliseconds ahead and requests before a data point with that timestamp exists). The whole point of this function is to tell phyphox which is the last value you received, so it can send you anything after that.

(11-08-2021, 06:10 PM)Jens Noritzsch Wrote: We are aware of SensorDirectChannel, however, Sebastian has not looked more deeply into it yet. The approach is quite different to the original way and the documentation –as well as information on devices supporting it– does not entirely sound promising, for instance, “actual rate is expected to be between 55% to 220% of nominal rate” – it appears to be optimised for more efficiency rather than higher rates.

It is on an ever-growing list of possible improvements with no plans when it could get be integrated. Certainly, one of the more interesting entries, however, also one of those that require some research to implement it on a reasonable level.