Other Parts Discussed in Thread: UNIFLASH
Hi all!
So I don't want you guys to get bored, so I have a new question :-)
In the past Simple Link Academy has been a massive help, but I did notice in the last days, that the information of using simple_central / multi_role as a GATT Client is very minimal. Therefor I do have some questions and yes I read chapter "Generic Attribute Profile (GATT)" and "ATT and GATT Introduction" multiple times, but I'm still stuck with the following question and problem.
1. When I use 2 multi_role devices that advertise and scan Simultaneously and connect to each other, how can I check which device is the Gatt Client and which the Gatt Server in this particular connection.
2. Without knowing how to solve no. 1 I try to write as a GATT Client to the GATT Server to a custom profile and I always get as a return "Write Error 1" when using GATT_WriteCharValue(), Here is my code where I try to write the Value to a custom profile after I press a button:
status_t status7;
uint8_t charVals[4] = { 0x04, 0x04, 0x04, 0x04 }; // Should be consistent with
// those in scMenuGattWrite
attWriteReq_t req;
req.pValue = GATT_bm_alloc(connHandle2, ATT_WRITE_REQ, 1, NULL);
if ( req.pValue != NULL )
{
uint8_t connIndex = multi_role_getConnIndex(connHandle2);
// connIndex cannot be equal to or greater than MAX_NUM_BLE_CONNS
MULTIROLE_ASSERT(connIndex < MAX_NUM_BLE_CONNS);
req.handle = connList[connIndex].charHandle;
req.len = 1;
charVal = charVals[1];
req.pValue[0] = charVal;
req.sig = 0;
req.cmd = 0;
status7 = GATT_WriteCharValue(connHandle2, &req, selfEntity);
if ( status7 != SUCCESS )
{
GATT_bm_free((gattMsg_t *)&req, ATT_WRITE_REQ);
}else
{
Display_printf(dispHandle, MR_ROW_MYADDRSS, 0, "Write Request Sent to connhandle %i", connHandle2);
}
}
This Is my multi_role_processGATTDiscEvent:
static void multi_role_processGATTDiscEvent(gattMsgEvent_t *pMsg)
{
uint8_t connIndex = multi_role_getConnIndex(pMsg->connHandle);
MULTIROLE_ASSERT(connIndex < MAX_NUM_BLE_CONNS);
if (connList[connIndex].discState == BLE_DISC_STATE_MTU)
{
// MTU size response received, discover Custom service
if (pMsg->method == ATT_EXCHANGE_MTU_RSP)
{
uint8_t uuid[ATT_BT_UUID_SIZE] = { LO_UINT16(CUSTOMSERVICE_SERV_UUID),
HI_UINT16(CUSTOMSERVICE_SERV_UUID) };
connList[connIndex].discState = BLE_DISC_STATE_SVC;
// Discovery Custom service
VOID GATT_DiscPrimaryServiceByUUID(pMsg->connHandle, uuid,
ATT_BT_UUID_SIZE, selfEntity);
}
}
else if (connList[connIndex].discState == BLE_DISC_STATE_SVC)
{
// Service found, store handles
if (pMsg->method == ATT_FIND_BY_TYPE_VALUE_RSP &&
pMsg->msg.findByTypeValueRsp.numInfo > 0)
{
svcStartHdl = ATT_ATTR_HANDLE(pMsg->msg.findByTypeValueRsp.pHandlesInfo, 0);
svcEndHdl = ATT_GRP_END_HANDLE(pMsg->msg.findByTypeValueRsp.pHandlesInfo, 0);
}
// If procedure complete
if (((pMsg->method == ATT_FIND_BY_TYPE_VALUE_RSP) &&
(pMsg->hdr.status == bleProcedureComplete)) ||
(pMsg->method == ATT_ERROR_RSP))
{
if (svcStartHdl != 0)
{
attReadByTypeReq_t req;
// Discover characteristic
connList[connIndex].discState = BLE_DISC_STATE_CHAR;
req.startHandle = svcStartHdl;
req.endHandle = svcEndHdl;
req.type.len = ATT_BT_UUID_SIZE;
req.type.uuid[0] = LO_UINT16(CUSTOM_SERV6_UUID);
req.type.uuid[1] = HI_UINT16(CUSTOM_SERV6_UUID);
VOID GATT_DiscCharsByUUID(pMsg->connHandle, &req, selfEntity);
}
}
}
else if (connList[connIndex].discState == BLE_DISC_STATE_CHAR)
{
// Characteristic found, store handle
if ((pMsg->method == ATT_READ_BY_TYPE_RSP) &&
(pMsg->msg.readByTypeRsp.numPairs > 0))
{
uint8_t connIndex = multi_role_getConnIndex(connHandle2);
// connIndex cannot be equal to or greater than MAX_NUM_BLE_CONNS
MULTIROLE_ASSERT(connIndex < MAX_NUM_BLE_CONNS);
// Store the handle of the QW characteristic 1 value
connList[connIndex].charHandle
= BUILD_UINT16(pMsg->msg.readByTypeRsp.pDataList[3],
pMsg->msg.readByTypeRsp.pDataList[4]);
Display_printf(dispHandle, 13, 0, "Custom Svc Found");
// Now we can use GATT Read/Write
tbm_setItemStatus(&mrMenuPerConn,
MR_ITEM_GATTREAD | MR_ITEM_GATTWRITE, MR_ITEM_NONE);
}
connList[connIndex].discState = BLE_DISC_STATE_IDLE;
}
}
This is my multi_role_processGATTMsg
static uint8_t multi_role_processGATTMsg(gattMsgEvent_t *pMsg)
{
// Get connection index from handle
uint8_t connIndex = multi_role_getConnIndex(pMsg->connHandle);
MULTIROLE_ASSERT(connIndex < MAX_NUM_BLE_CONNS);
if (pMsg->method == ATT_FLOW_CTRL_VIOLATED_EVENT)
{
// ATT request-response or indication-confirmation flow control is
// violated. All subsequent ATT requests or indications will be dropped.
// The app is informed in case it wants to drop the connection.
// Display the opcode of the message that caused the violation.
Display_printf(dispHandle, MR_ROW_CUR_CONN, 0, "FC Violated: %d", pMsg->msg.flowCtrlEvt.opcode);
}
else if (pMsg->method == ATT_MTU_UPDATED_EVENT)
{
// MTU size updated
Display_printf(dispHandle, MR_ROW_CUR_CONN, 0, "MTU Size: %d", pMsg->msg.mtuEvt.MTU);
}
// Messages from GATT server
if (linkDB_Up(pMsg->connHandle))
{
if ((pMsg->method == ATT_READ_RSP) ||
((pMsg->method == ATT_ERROR_RSP) &&
(pMsg->msg.errorRsp.reqOpcode == ATT_READ_REQ)))
{
if (pMsg->method == ATT_ERROR_RSP)
{
Display_printf(dispHandle, SP_NVS_DEBUG, 0, "Read Error %d", pMsg->msg.errorRsp.errCode);
}
else
{
// After a successful read, display the read value
Display_printf(dispHandle, SP_NVS_DEBUG, 0, "Read rsp: %d", pMsg->msg.readRsp.pValue[0]);
}
}
else if ((pMsg->method == ATT_WRITE_RSP) ||
((pMsg->method == ATT_ERROR_RSP) &&
(pMsg->msg.errorRsp.reqOpcode == ATT_WRITE_REQ)))
{
if (pMsg->method == ATT_ERROR_RSP)
{
Display_printf(dispHandle, 0, SP_NVS_DEBUG, "Write Error %d", pMsg->msg.errorRsp.errCode);
}
else
{
// After a succesful write, display the value that was written and
// increment value
Display_printf(dispHandle, SP_NVS_DEBUG, 0, "Write sent: %d", charVal);
}
tbm_goTo(&mrMenuPerConn);
}
else if (connList[connIndex].discState != BLE_DISC_STATE_IDLE)
{
multi_role_processGATTDiscEvent(pMsg);
}
} // Else - in case a GATT message came after a connection has dropped, ignore it.
// Free message payload. Needed only for ATT Protocol messages
GATT_bm_free(&pMsg->msg, pMsg->method);
// It's safe to free the incoming message
return (TRUE);
}
If I write a 0x04 to the characteristic Value CUSTOM_SERV6_UUID via the SimpleLink iOS app it works perfectly, but not if I do it from the multi_role -> multi_role.
I'm pretty sure I have a mistake there, I noticed that everything is very well explained, but I think the information how a GATT Client operates is very minimal and the past questions in the forum are not a big help.
Thanks in advance.
Kind Regards,
SPEEDBIRD
