Tool/software:
Hello Experts,
I'm implementing BLE central +peripheral mode firmware for CC2340R5 with the data_stream example and I need to switch the mode form central to peripheral as per the signal read at gpio pin of BLE module.
After switching the mode to central I need to connect to the peripheral by identifying the MAC address or UUID.
Please provide me the reference.
Thank you.
Hello Aman,
Thanks for reaching out.
Could you please confirm the SDK version as well as if you are using the Peripheral + Central configuration from SysConfig?
BR,
David.
Hello Aman,
I would suggest to take a look at how the peripheral+central coexist in a multi-role example. You can enable this through SysConfig.
I will check with the team of with have an example to change roles based on a interrupt, let me get back to you on this one.
BR,
David.
Hello David,
I hope this message finds you well. I am currently working on implementing a client application within the data_stream project and aim to set up UART-BLE communication similar to the server setup in the same project.
My objective is for the central device to transmit UART data to the data_stream's dataOut characteristic. Simultaneously, I need to ensure that any incoming data on the dataIn characteristic triggers a notification, allowing the central device to write this data to UART. I've attached screenshots to confirm if my current approach is correct.
Could you please review the attached screenshots and confirm if this is the proper way to handle the communication? Additionally, could you provide any references or guidance on how to implement seamless point-to-point communication between two CC2340R5 devices configured in both Peripheral and Central roles with the data_stream project?
Lastly, I need some assistance with where and how to register the callbacks necessary for notifying and writing to the data_stream characteristics.
Thank you for your guidance and support.
Hello experts,
I'm working on implementing a server-client feature with the CC2340R5 in a data stream project that involves both Peripheral and Central roles.
As a Central device, I successfully connected to a Peripheral and obtained the connection handle. Now, I need to discover the specific service and characteristic handles available on the server.
I have implemented the code for service discovery and am receiving the service discovery event. However, I am having difficulty retrieving the correct characteristic handles, as well as I'm not sure if start and end handles for the services are correct, Below I have added screenshot of logs printed on UART terminal
Could you please provide reference code or guidance on how to correctly retrieve the service and characteristic handles? I am sharing the code here, and would appreciate any suggestions on improvements or changes that may be necessary.
void discoverServices(void) {
uint8_t serviceUuid[ATT_UUID_SIZE] = {TI_BASE_UUID_128(SIMPLESTREAMSERVER_SERV_UUID)};
bStatus_t status;
// Initiate service discovery
vTaskDelay(pdMS_TO_TICKS(20));
status = GATT_DiscPrimaryServiceByUUID(connHandle, serviceUuid, ATT_UUID_SIZE, BLEAppUtil_getSelfEntity());
if (status != SUCCESS) {
logError("Failed to initiate service discovery.");
} else {
UART2_write(uartHandle, "Service discovery initiated\n", strlen("Service discovery initiated\n"), NULL);
vTaskDelay(pdMS_TO_TICKS(10));
}
}
void discoverCharacteristics(void) {
bStatus_t status;
vTaskDelay(pdMS_TO_TICKS(20));
status = GATT_DiscAllChars(connHandle, serviceStartHandle, serviceEndHandle, BLEAppUtil_getSelfEntity());
if (status != SUCCESS) {
logError("Failed to initiate characteristic discovery.");
} else {
UART2_write(uartHandle, "Characteristic discovery initiated\n", strlen("Characteristic discovery initiated\n"), NULL);
vTaskDelay(pdMS_TO_TICKS(10));
}
}
static void GATT_EventHandler(uint32 event, BLEAppUtil_msgHdr_t *pMsgData)
{
gattMsgEvent_t *gattMsg = ( gattMsgEvent_t * )pMsgData;
char buffer[40]; // Adjust the size if needed
switch ( gattMsg->method )
{
case ATT_FIND_BY_TYPE_VALUE_RSP:
{
if(gattMsg->msg.findByTypeValueRsp.numInfo > 0){
serviceStartHandle = ATT_ATTR_HANDLE(gattMsg->msg.findByTypeValueRsp.pHandlesInfo, 0);
serviceEndHandle = ATT_GRP_END_HANDLE(gattMsg->msg.findByTypeValueRsp.pHandlesInfo, 0);
if(serviceStartHandle != 0 && serviceEndHandle != 0){
snprintf(buffer, sizeof(buffer), "Start: 0x%x, End: 0x%x\n", serviceStartHandle, serviceEndHandle);
UART2_write(uartHandle, buffer, strlen(buffer), NULL);
vTaskDelay(pdMS_TO_TICKS(10));
}
}
else{
UART2_write(uartHandle, "No Service handle found\n", strlen("No handle found\\n"), NULL);
vTaskDelay(pdMS_TO_TICKS(20));
}
}
discoverCharacteristics();
break;
case ATT_READ_BY_TYPE_RSP:
if(gattMsg->msg.findInfoRsp.numInfo > 0)
for (uint8_t i = 0; i < gattMsg->msg.readByTypeRsp.numPairs; i++)
{
uint8_t *attrData = gattMsg->msg.readByTypeRsp.pDataList + (i * gattMsg->msg.readByTypeRsp.len);
uint16_t handle = BUILD_UINT16(attrData[0], attrData[1]);
uint16_t uuid = BUILD_UINT16(attrData[2], attrData[3]);
// Print the UUID and handle for each discovered characteristic
snprintf(buffer, sizeof(buffer), "UUID: 0x%x, Handle: 0x%x\n", uuid, handle);
UART2_write(uartHandle, buffer, strlen(buffer), NULL);
vTaskDelay(pdMS_TO_TICKS(10));
if (uuid == SIMPLESTREAMSERVER_DATAIN_UUID)
{
dataInCharHandle = handle;
UART2_write(uartHandle, "DataIn characteristic found\n", strlen("DataIn characteristic found\n"), NULL);
vTaskDelay(pdMS_TO_TICKS(10));
}
else if (uuid == SIMPLESTREAMSERVER_DATAOUT_UUID)
{
dataOutCharHandle = handle;
UART2_write(uartHandle, "DataOut characteristic found\n", strlen("DataOut characteristic found\n"), NULL);
vTaskDelay(pdMS_TO_TICKS(10));
}
}
else{
UART2_write(uartHandle, "No Characteristics Handle Found\n", strlen("No Characteristics Handle Found\n"), NULL);
vTaskDelay(pdMS_TO_TICKS(10));
}
break;
