Hi,
We are trying to use BC127 to connect to to car infotainment system. In most of the cases it work fine, but we seeing issue in some cases.After we issue INQUIRY 5 command BC127 just resets. We know mac address of the infotainment system and if we hardcode it it can connect to it without problem, but INQUIRY command just failing
We are trying to move from Melody 5.8 to 7.3 and we also have this exact problem.
Sometimes it works for several cycles of “INQUIRY 5”, sometimes it repeatedly resets after the first few results.
Did you find what could be the reason. I feel it depends on device which is currently pairing. With some devices we dont see this issue at all, but with some we never get any result from INQUIRY command. always resets
No, we don’t know what the reason is.
We did several tests to rule out hardware issues on our side, like power supply etc. but everything seems fine. And older versions of the firmware definitely did not show the issue. I’d track down the version when the issue first appeared, but sadly Sierra Wireless seems to have removed all the older pre-7.0 versions of the Melody firmware.
I can not confirm that pairing/paired devices have an influence on the issue. To me it seems somewhat related to how many Bluetooth devices are in the area. It seems on “slow days” when only few people with their phones etc. are around, INQUIRY seems to reset less often.
Hi,
we use the BC127 module as a handsfree device in a car infotainment system. we have the same issue: when we issue the INQUIRY command the BC127 sometimes resets.
As we have discovered, it only happens when there is an special phone device with bluetooth interface open in the nearby zone. In our case this phone model is “Xiami Mi Note 8” Whenever this device is open and close to the module, the reset after INQUIRY happens all the time (INQUIRY/PENDING/then after 1 second or so the device resets)
Some clients have reported the same issue, when they scan for nearby devices (INQUIRY command) nothing appears on the list (that’s because the module resets and the app acts as if there is no response from the module)
We have checked with Melody V7.1 and Melody V7.3 with the same result. What can we do to solve this issue? is there any new Firmware that solves this problem?
Hi,
I think I found a solution to this problem:
Long story short, you need to increase your Baud Rate to 230400 or higher using:
SET UART_CONFIG=230400 OFF 0
followed by WRITE (You need to reopen serial port with baud rate 230400 before)
and finally RESET.
The above solution worked for me.
Longer story: I suspect the buffer on the BC127 gets filled up easily and it needs to empty more frequently in order to avoid a hard reset (hence the higher baud rate). This could be a problem in case you are in a noisy environment with a lot of BT Classic devices around.