Datasheet

# Add the HRM service and characteristic definitions

try:

atcommand("AT+FACTORYRESET", 1000) # Wait 1s for this to complete

atcommand("AT+GATTCLEAR")

atcommand("AT+GATTADDSERVICE=UUID=0x180D")

atcommand("AT+GATTADDCHAR=UUID=0x2A37, PROPERTIES=0x10, MIN_LEN=2, MAX_LEN=3, VALUE=00-40")

atcommand("AT+GATTADDCHAR=UUID=0x2A38, PROPERTIES=0x02, MIN_LEN=1, VALUE=3")

atcommand("AT+GAPSETADVDATA=02-01-06-05-02-0d-18-0a-18")

# Perform a system reset and wait 1s to come back online

atcommand("ATZ", 1000)

# Update the value every second

while True:

atcommand("AT+GATTCHAR=1,00-%02X" % random.randint(50, 100), 1000)

except ValueError as err:

# One of the commands above returned "ERROR\n"

errorhandler(err)

except KeyboardInterrupt:

# Close gracefully on CTRL+C

ser.close()

sys.exit()

The results of this script can be seen below in the 'HRM' app of Nordic's nRF Toolbox application:

Please note that nRF Toolbox will only display HRM data if the value changes, so you will need to update the

Heart Rate Measurement characteristic at least once after opening the HRM app and connecting to the

BLEFriend

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