What is the maximum data payload allowed in broadcasting mode?

Light AiYee

Other Parts Discussed in Thread: CC2541

I would like to add multiple sensors and broadcast the data to the receiver. May I know what is the maximum data payload allowed in broadcasting mode so that I know how many sensor data can be sent in a packet?

I am using CC2541.

over 11 years ago

0 Eirik V over 11 years ago

TI__Guru 56590 points

Hello Light,

26 Bytes is the maximum for you your application. and in addition to that you need 11 bytes of overhead so that you end up at a total of 37 Bytes. In addition to that you will also send more bytes over the air such as preamble, sync word and CRC bytes.

Below you can see the payload structure when using maximum packet size allowed for BLE packets:

Name		Bit(s)	Value	Comment
Header	PDU Type	4	0b0010	ADV_NONCONN_IND
	RFU	2	0	Reserved for future use, don’t care
	TxADD	1	0	Don’t care
	RxADD	1	0	Don’t care
	Length	6	0b100110	37 Bytes (AdvA + AdvData)
	RFU	2	0	Reserved for future use, don’t care
Payload	AdvA	6 x 8	0xXXXXXXXXXXXX	Address
Payload	AdvData	31 x 8	*Vary..*	Data, Format TBD

AdvData

AD Type	Value
Flags	0x02	Length of next Data (3 Byte)
	0x01	Type Flag
	0x04	BR/EDR Not Supported
Manufacturer Specific Data	0x1B	Length of next Data (27 Byte)
	0xFF	Type “Manufacturer Specific Data”
	0xXX .. XX	26 Byte of Application Data

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What is the maximum data payload allowed in broadcasting mode?