jukebike-iot-player

#saveThePlanetWithMusic JukeBike IOT player source code

SET UP THE IOT (RASPBERRY PI)

Hardware: Audio setup

Debug audio issues

Note: Test audio on pi using the following command:

speaker-test -c2 -twav -l7

Note: Install alsa-utils to debug sound issues:

sudo apt-get install alsa-utils
# list all sound devices
aplay -L

Get / set volume level

# ex. for default audio jack
amixer get PCM
amixer set PCM 100%

# ex. for hifiberry being card 1
amixer -c 1 set Digital 80%

Hardware: Set up 4G connectivity

Plug USB LTE Stick onto RPi and install tooling:

sudo apt install wvdial
sudo apt install usb-modeswitch

Reboot.

Edit /etc/wvdial.conf - add a new lte section: (adjusted solution from https://forum.siduction.org/index.php?topic=823.30)

[Dialer Defaults]
Init1 = ATZ # TODO removed!!!
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 # TODO removed!!!
Modem Type = Analog Modem
ISDN = 0
New PPPD = yes
Modem = /dev/ttyUSB0
Baud = 921600 # maybe 9600, 57600, 115200 460800 or 760000

[Dialer pin]
Init3 = AT+CPIN=<SIM PIN>

[Dialer umts]
Carrier Check = no
Init4 = at+cgdcont=1,"IP","<ISP APN gateway>"
Stupid Mode = 1
Phone = *99#
Dialer Command = ATD
Dial Attemps = 2
Username = dontcare
Password = dontcare

Note: The following settings depend on your SIM & provider:

• Replace <SIM PIN>
• Replace <ISP APN gateway>

Test with:

sudo wvdial pin
sudo wvdial umts

Add LTE connect to boot routine:

Create /lib/systemd/system/umts.service:

[Unit]
Description=UMTS dial in
After=multi-user.target

[Service]
Type=idle
ExecStart=-/opt/wvdial_start.sh

[Install]
WantedBy=multi-user.target

sudo chmod 644 /lib/systemd/system/umts.service
sudo systemctl daemon-reload
sudo systemctl enable umts.service
sudo reboot

/opt/wvdial_start.sh (give +x permission):

#!/bin/bash

sleep 2
/usr/bin/wvdial pin
sleep 5
/usr/bin/wvdial umts

exit 0

Hint: Debug service using:

journalctl -u umts.service

Software: Set up python environment (on RPi)

sudo pip3 install requests
sudo wget -q -O /etc/apt/sources.list.d/mopidy.list https://apt.mopidy.com/buster.list
sudo apt-get update && sudo apt-get install -y libspotify-dev
sudo pip3 install pyspotify
sudo pip3 install pyalsaaudio

Register jukebike-iot-player as service (on RPi)

Create /lib/systemd/system/jukebike.service:

[Unit]
Description=JukeBike IOT Player
Requires=multi-user.target

[Service]
Type=idle
#ExecStart=/usr/bin/python3 /home/pi/jukebike-iot-player/jukebike_iot_player.py
ExecStart=/bin/bash /home/pi/jukebike-iot-player/start_service.sh

[Install]
WantedBy=multi-user.target

sudo chmod 644 /lib/systemd/system/jukebike.service
sudo systemctl daemon-reload
sudo systemctl enable jukebike.service
sudo reboot

Hint: Debug service using:

sudo systemctl <start|stop> jukebike.service
journalctl -u jukebike.service

DEVELOPMENT SETUP

Create secret_config.py with the following contents:

SPOTIFY_AUTH = {
    'username': '<spotify username>',
    'password': '<spotify password>'
}

JUKEBIKE_CONF = {
    'API_ROOT': '<URL to jukebike-cloud API>',
    'PCM_ID': '<PCM sound device ID>'
}

e.g., use this for hifiberry soundcard:

'PCM_ID': 'plughw:CARD=sndrpihifiberry,DEV=0'

DEPLOY TO IOT

configure and run (on dev machine):

./deploy_jukebike_iot_player.sh

run (on IoT device / raspberry):

python3 jukebike_iot_player.py