User's Guide

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LM074 SPP with GAP Central Application v1.1

xi. Above report shows the WRCharval command is successful only on

characteristic 0005 and 0007.

xii. If the WrCharVal command fails in execution, then the error code

reported by BLE-stack is reported to user in failure report. E.g.

Err_code:fd , Err_code:0e, Err_code:0d

xiii. Refer Appendix section for more details on error code.

3.8.5 “AT*SIWRWORESP”\r\n

i. Execution only command

ii. This command is used to send data to BLE device for the

characteristic which has properties as “Si_Wrt” i.e. 0x40.

iii. Command format is “AT*WRCHARVAL=conn-ID, char-Handle,

length, actual-bytes”.

iv. e.g. “at*WRCHARVAL=1,0019,10,12345abcdef!()12” command is

used to send data to 1st connected device, on characteristic 0019.

No of bytes to write are 16 (0x10) and actual bytes are

12345abcdef!()12.

v. As shown in the example command, no of bytes to transmit is hex

value

vi. As shown in the example command, actual data bytes are not

separated by comma. When the value 0x31 is sent i.e. ASCII 1 is

sent, the data buffer is copied and sent to remote device

transparently.

vii. Note : The actual data bytes to be sent should not have “\r\n” as

the data itself because it is the terminating string for AT command

parser.

viii. For command “AT*WRWORESP=conn-ID, char-Handle, length,

actual-bytes” module gives OK response if all the following

conditions are true:

a. connection ID is correct (if module is connected to 3 devices

and CID mentions 4, then it is invalid)

b. Characteristic handle has Wr_req properties

c. Value of “length” field is less than 21 i.e. (0x15).

d. Actual data bytes are same as value of “length” field.

ix. After module responds to this command as OK, module sends the

data to remote BLE device.