Name: Alert Category ID

Type: org.bluetooth.characteristic.alert_category_idDownload / View

Assigned Number: 0x2A43


Categories of alerts/messages.


The value of the characteristic is an unsigned 8 bit integer that has a fixed point exponent of 0. The Alert Category ID characteristic defines the predefined categories of messages as an enumeration.


The value 0x01 is interpreted as “Email”

Value Fields

Names Field Requirement Format Minimum Value Maximum Value Additional Information
Category ID
uint8 0 255
Key Value
0 Simple Alert: General text alert or non-text alert
1 Email: Alert when Email messages arrives
2 News: News feeds such as RSS, Atom
3 Call: Incoming call
4 Missed call: Missed Call
5 SMS/MMS: SMS/MMS message arrives
6 Voice mail: Voice mail
7 Schedule: Alert occurred on calendar, planner
8 High Prioritized Alert: Alert that should be handled as high priority
9 Instant Message: Alert for incoming instant messages
10 - 250 Reserved for future use
251 - 255 Defined by service specification


The fields in the above table are in the order of LSO to MSO. Where LSO = Least Significant Octet and MSO = Most Significant Octet.