Hi Ankur, > -----Original Message----- > From: linux-bluetooth-owner@xxxxxxxxxxxxxxx [mailto:linux-bluetooth- > owner@xxxxxxxxxxxxxxx] On Behalf Of Ankur Patel > Sent: Saturday, May 23, 2015 9:10 AM > To: linux-bluetooth@xxxxxxxxxxxxxxx > Subject: Issue Write Not Permitted Error Response not working > > Hello Folks, > > After implementing and running the test case for Characteristics Write Not > Permitted Response (TC_GAW_SR_BI_15_C), it failed. Following the Trace, I > found that Bluez (Controller) Sends ATT "Error Response: Write not > Permitted" after receiving "Execute Write Request" from Host instead of > sending the "Error Response" after receiving "Prepare Write Request" from > Host. > > Current ATT Message Exchange (Host <> Controller) > ---------------------------------------------------- > Frame#41(H->C): Prepare Write Request > Frame#43(C->H): Prepare Write Response > Frame#44(H->C): Execute Write Request > Frame#46(C->H): Error Response with code "Write Not Permitted" > > Expected ATT Message Exchange (Host <> Controller) > ---------------------------------------------------- > (H->C): Prepare Write Request > (C->H): Error Response with code "Write Not Permitted" > > Please find the attached Trace Capture via PTS software as > http://www.filedropper.com/tcgawsrbi15c20150523090341 > > Code Snippet (Registered Characteristic as below - for Write not permitted): > > gatt_db_service_add_characteristic(service, &uuid, > BT_ATT_PERM_READ | BT_ATT_PERM_WRITE, > BT_GATT_CHRC_PROP_READ | BT_GATT_CHRC_PROP_WRITE, > custom_ccc_read_cb, custom_not_permi_resp_write_cb, > server); > PTS FAILS: Here you are trying to write on a CHARC which is already given write permission. So, in this case BlueZ will send Success Prepare Write Response, which is correct. PTS PASS: But If you remove the write permission from above code snippet, Bluez will send Write Not Permitted Error Response, which makes TC_GAW_SR_BI_15_C PASS. For more info you can start tools/btgatt-server and emulate all services and cross-check the functionality. Let others comment on this. > static void custom_not_permi_resp_write_cb(struct gatt_db_attribute > *attrib, > unsigned int id, uint16_t offset, const uint8_t *value, size_t len, > uint8_t opcode, struct bt_att *att, void *user_data) { > uint8_t ecode = 0x3; > gatt_db_attribute_write_result(attrib, id, ecode); } > > Any idea on why Bluez is not sending the Error Response After Prepare Write > Request from Host? > > Regards, > Ankur. > -- Regards, Gowtham Anandha Babu > To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in > the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo > info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
