No response from Bacnet mstp device

[codev123]

Hi, thankyou for your amazing library.
I have installed Misty firmware on raspberry pi and connected on its serial usb port using usb to modbus converter at /dev/ttyUSB0. i am able to execute program using

sudo bc --ini ./bc.ini

but i am not able to get any response from my connected mstp device, while i am able to communicate to that device using YABE. i get no response on whois, iam or read commands. here is my bc.ini file

[BACpypes]
objectName: BACClient
address: 25
interface:/dev/ttyUSB0
max_masters: 127
baudrate: 76800
maxinfo:1
objectIdentifier: 599
maxApduLengthAccepted: 1024
segmentationSupported: segmentedBoth
vendorIdentifier: 15
foreignPort: 0
foreignBBMD: 128.253.109.254
foreignTTL: 30
; enable this to see the mstp debug logs
mstpdbgfile:/home/pi/abcd.log

the response on putty when i execute above command

pi@raspberrypi:~ $ sudo bc --ini ./bc.ini
Logging debug messages in '/home/pi/abcd.log'
Initialized the socket
mac_address = 25
max master = 127
baud rate = 76800
max info frames = 1
RS485: Initializing /dev/ttyUSB0=success!
MS/TP MAC: 19
MS/TP Max_Master: 7F
MS/TP Max_Info_Frames: 1
mstp_path=/var/tmp/ma_bjudrva3/mstpttyUSB0
> whois
>

what do i do wrong? please help me.

abcd.log file

MSTP Rx: State=IDLE Data=00 hCRC=00 Index=0 EC=0 DateLen=0 Silence=6
MSTP: TS=19[1A] NS=19[1A] PS=19[1A] EC=0 TC=50 ST=7 IDLE
MSTP Rx: State=IDLE Data=00 hCRC=00 Index=0 EC=0 DateLen=0 Silence=12
MSTP Rx: State=IDLE Data=00 hCRC=00 Index=0 EC=0 DateLen=0 Silence=17
MSTP Rx: State=IDLE Data=00 hCRC=00 Index=0 EC=0 DateLen=0 Silence=20
MSTP Rx: State=IDLE Data=EB hCRC=00 Index=0 EC=0 DateLen=0 Silence=20
MSTP Rx: EB
MSTP Rx: State=IDLE Data=EB hCRC=00 Index=0 EC=1 DateLen=0 Silence=6
MSTP Rx: State=IDLE Data=EB hCRC=00 Index=0 EC=1 DateLen=0 Silence=11
MSTP Rx: State=IDLE Data=EB hCRC=00 Index=0 EC=1 DateLen=0 Silence=16
MSTP Rx: State=IDLE Data=EB hCRC=00 Index=0 EC=1 DateLen=0 Silence=21
MSTP Rx: State=IDLE Data=EB hCRC=00 Index=0 EC=1 DateLen=0 Silence=22
MSTP Rx: State=IDLE Data=C9 hCRC=00 Index=0 EC=1 DateLen=0 Silence=22
MSTP Rx: C9
MSTP Rx: State=IDLE Data=C9 hCRC=00 Index=0 EC=2 DateLen=0 Silence=6
MSTP Rx: State=IDLE Data=C9 hCRC=00 Index=0 EC=2 DateLen=0 Silence=11
MSTP Rx: State=IDLE Data=C9 hCRC=00 Index=0 EC=2 DateLen=0 Silence=16
MSTP Rx: State=IDLE Data=C9 hCRC=00 Index=0 EC=2 DateLen=0 Silence=21
MSTP Rx: State=IDLE Data=C9 hCRC=00 Index=0 EC=2 DateLen=0 Silence=22
MSTP Rx: State=IDLE Data=CB hCRC=00 Index=0 EC=2 DateLen=0 Silence=22
MSTP Rx: CB
MSTP Rx: State=IDLE Data=CB hCRC=00 Index=0 EC=3 DateLen=0 Silence=6
MSTP Rx: State=IDLE Data=CB hCRC=00 Index=0 EC=3 DateLen=0 Silence=11
MSTP Rx: State=IDLE Data=CB hCRC=00 Index=0 EC=3 DateLen=0 Silence=16
MSTP Rx: State=IDLE Data=CB hCRC=00 Index=0 EC=3 DateLen=0 Silence=21
MSTP Rx: State=IDLE Data=CB hCRC=00 Index=0 EC=3 DateLen=0 Silence=22
MSTP Rx: State=IDLE Data=E1 hCRC=00 Index=0 EC=3 DateLen=0 Silence=22
MSTP Rx: E1
MSTP Rx: State=IDLE Data=E1 hCRC=00 Index=0 EC=4 DateLen=0 Silence=6
MSTP Rx: State=IDLE Data=E1 hCRC=00 Index=0 EC=4 DateLen=0 Silence=11
MSTP Rx: State=IDLE Data=E1 hCRC=00 Index=0 EC=4 DateLen=0 Silence=16
MSTP Rx: State=IDLE Data=E1 hCRC=00 Index=0 EC=4 DateLen=0 Silence=21
MSTP Rx: State=IDLE Data=E1 hCRC=00 Index=0 EC=4 DateLen=0 Silence=22
MSTP Rx: State=IDLE Data=EB hCRC=00 Index=0 EC=4 DateLen=0 Silence=22