bluez 5.47 rfcomm without legacy tools

[lennylennard]

hello!
i am trying to connect and communicate to a HC-05 module.
raspberry pi 3 bluetooth <-> hc-05

however since many of the old tools from the bluez4 era are deprecated i only want to use
the tools provided from bluez-utils 5.47-2

what i did so far starting from a fresh installation:
$this->bbcode_second_pass_code('', '
pacman -Syu
reboot...
pacman -S firmware-raspberrypi
pacman -S bluez bluez-utils
pacman -S rfkill
reboot...
modprobe bluetooth
modprobe btbcm
systemctl start bluetooth
')

$this->bbcode_second_pass_code('', 'systemctl status bluetooth
* bluetooth.service - Bluetooth service
Loaded: loaded (/usr/lib/systemd/system/bluetooth.service; enabled; vendor preset: disabled)
Active: active (running) since Wed 2017-09-27 18:38:37 UTC; 3s ago
Docs: man:bluetoothd(8)
Main PID: 415 (bluetoothd)
Status: "Running"
Tasks: 1 (limit: 4915)
CGroup: /system.slice/bluetooth.service
`-415 /usr/lib/bluetooth/bluetoothd

Sep 27 18:38:37 rpi3 systemd[1]: Starting Bluetooth service...
Sep 27 18:38:37 rpi3 bluetoothd[415]: Bluetooth daemon 5.47
Sep 27 18:38:37 rpi3 systemd[1]: Started Bluetooth service.
Sep 27 18:38:37 rpi3 bluetoothd[415]: Starting SDP server
Sep 27 18:38:37 rpi3 bluetoothd[415]: Bluetooth management interface 1.14 initialized
')

$this->bbcode_second_pass_code('', '
btattach -B /dev/ttyAMA0 -P bcm -N

Attaching Primary controller to /dev/ttyAMA0
Switched line discipline from 0 to 15
Device index 0 attached
')

$this->bbcode_second_pass_code('', '
rfkill list
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
')

dmesg shows:
$this->bbcode_second_pass_code('', '
Bluetooth: hci0 command 0xfc45 tx timeout
Bluetooth: hci0: BCM: failed to write clock (-110)
Bluetooth: hci0 command 0x0c03 tx timeout
Bluetooth: hci0: BCM: Reset failed (-110)
')

also bluetoothctl shows me no devices

...and this is pretty much where i am at :/
has anyone done this before?
any hints? any ideas?