Omblepy

Cli tool to read records from Omron Bluetooth-LE measurement instruments

OS support

operating system / hardware	supported	install instruction / comment
win10	✅	install python, enable installer checkbox add to path in cmd pip install terminaltables bleak
win11	❌	instructions of win10 work in principle, but win11 ble pairing dialog timeout is only 1 second.
nixos23.05	✅	in configuration.nix, set hardware.bluetooth.enable = true;. For temporary python shell: nix-shell -p python3.11 python311Packages.bleak python311Packages.terminaltables
debian11/12	❓/❌	unreliable, depends on bt-hardware / bluez-version if pairing will work. Install python and packages with apt install python3.12 pip3 install bleak terminaltables
raspberry pi os + PI 4B / 5	✅	see debian 12 for install instructions
mac	❌	the used bluetooth library bleak is missing the pairing feature on osx
all os + esp32	✅	see under-development esp32 bridge version.

Usage

For the first time pairing process you need to use the -p flag and enable pairing mode by holding the bluetooth button until you see the blinking -P- in the display:

python ./omblepy.py -p -d HEM-7322T

Linux might start python2.X, use the correct command to launch a python3.X interpreter on your machine e.g. python3. After the first connection the -p flag can be omitted, even when executing omblepy on a different device:

python ./omblepy.py -d HEM-7322T

Pairing for Universal Blood Pressure Manager (UBPM)

If you preform this pairing for Universal Blood Pressure Manager (UBPM), just use one of the supported devices (e.g. -d HEM-7322T), even if your device model is different. As far as I know the pairing process is similar for all omron devices. If you use an unsupported device it is expected that the pairing will work and that the -P- on the display of the omron device will change to a small square. But the tool will crash further in the readout, because the data format / readout commands for the stored records are different. Nevertheless your omron device is now bound to the mac address of your pc and UBPM should work without mac address spoofing.
If you see the message "Could not enter key programming mode." or "Failure to program new key." the pairing procedure did NOT work. Please see the troubleshooting section and if the problem persists please open an issue.
Success is indicated by the message "Paired device successfully with new key".

Flags table

flag	alternative long flag	always required	required on first connection	potentially dangerous eeprom write	description	usage example
-h	--help	-	-	-	display help for all possible flags, similar to this table	python3 ./omblepy.py -h
-d	--device	✔️	✔️	-	select which device library will be loaded from here	python3 ./omblepy.py -d HEM-7322T
-p	--pair	❌	✔️	-	use to write pairing key on first connection with this pc	python3 ./omblepy.py -d HEM-7322T -p
-m	--mac	❌	❌	-	select omron devices mac and skip bluetooth scan and device selection dialog	python3 ./omblepy.py -d HEM-7322T -m 11:22:33:44:55:66
-n	--newRecOnly	❌	❌	❗	instead of downloading all records, check and update the "new records couter" and only transfer new records	python3 ./omblepy.py -d HEM-7322T -n
-t	--timeSync	❌	❌	❗	synchronize omron internal clock with system time	python3 ./omblepy.py -d HEM-7322T -t
	--loggerDebug	❌	❌	-	displays every ingoing and outgoing data for debugging purposes	python3 ./omblepy.py -d HEM-7322T --loggerDebug

Potentially dangerous, refers to the possibility to mess up the calibration data for the pressure sensor, which is likely stored in the eeprom in the settings region.
This is most important when you are trying to add support for a new device.

Omron device support matrix

device model	sold under name	pairing	basic data readout	new record counter	time sync	contributors / testers / help by
HEM-7150T	BP7250	✔️	✔️	❓	❓	Toei79, userx14
HEM-7155T	M400 / M4	✔️	✔️	✔️	✔️	dromie, RobertWojtowicz
HEM-7322T	M700 Intelli IT	✔️	✔️	✔️	✔️	userx14
HEM-7342T	BP7450	✔️	✔️	❓	❓	Toei79, userx14
HEM-7361T	M500 Intelli IT / M7 Intelli IT	✔️	✔️	✔️	✔️	LazyT, userx14, zivanfi, RobertWojtowicz
HEM-7530T	Omron Complete	✔️	✔️ (no EKG)	❌	❌	Toei79, userx14
HEM-7600T	Omron Evolv	✔️	✔️	✔️	✔️	vulcainman

✔️=tested working, ❓=not tested , ❌=not supported yet

Please open an issue if you can test a feature or an currently unsupported device.
It is potentially dangerous to write to the eeprom on devices where the eeprom layout is unknown (see Flags table),
since the calibration data for the pressure sensor is likeley also stored there.

Troubleshooting

• Remove the pairing with the omron device using your os bluetooth dialog.
• Use a bluetooth chipset/dongle which supports at least bluetooth 4.2, better 5.0
• On the devices I had available for testing, win10 did always work, while ubuntu didn't work on some versions.
• If the pairing works and there is an error in the readout use the --loggerDebug flag and please open an issue.
• Windows specific
  • Do not use the CSR harmony stack (CSR 8510 based usb dongles), it is incompatible.
• Linux specific
  • Preferably test on a device with only one bluetooth adapter connected.
  • on non gui systems open bluetoothctl in a second multiplexed terminal for the bluetooth pairing to work, for an automated solution see this issue
  • Restart the bluetooth stack sudo systemctl restart bluetooth.
  • Delete the bluetooth adapter cache with sudo rm -r /var/lib/bluetooth/$yourBtCardMacAddress.
  • If you have two bluetooth adapters in your system, open a second terminal alongside omblepy and use bluetoothctl to confirm pairing dialogs by typing yes when promped, some graphical interfaces will not show the pairing dialog for the second adapter.
  • When you are on ubuntu, install blueman, since it seems to be designed with multiple adapters in mind.
  • Try other versions of bluez, for me versions around bluez 5.55 worked best.

Documentation

The general communication is handled in the first 250 lines of omblepy.py.

command types (bytes 1-3 of header):

PC -> omron device

command type bytes	function	packet size
0000	start of transmission / read device id from eeprom	0x08 bytes with checksum
0100	read data from eeprom	0x08 bytes with checksum
01c0	write data to eeprom	0x08 bytes + sizeof(data to write)
0f00	end of transmission	0x08 bytes

omron device -> PC

response type bytes	function	packet size
8000	response start transmission	0x18 bytes with checksum
8100	response read data	0x08 bytes + sizeof(attached data read from eeprom)
81c0	response write data	same size as corresponding write command
8f00	response end transmission	0x08 bytes

Packet header for reads:

Example message sent to request a read of 0x26 bytes starting from address 0x0260:

messagelength	command type	start address	readsize	padding	crc, such that all bytes xored = 0
0x08	0x0100	0x0260	0x26	0x00	0x4d

Related Projects

A huge thank you goes to LazyT and his UBPM project which provided extremely usefull insight how the reception with multiple bluetooth channels works.

The export2garmin project can be used to import the data from the omron device into Garmin Connect.

The USB communication of selected omron medical equipment is implemented by libomron and shares some similarities with the bluetooth communication.