Hi folks, I am trying to get the RSSI value from an established RFCOMM connection. While searching on the Internet for hints I found the following discussions: http://comments.gmane.org/gmane.linux.bluez.user/9986 http://stackoverflow.com/questions/2149295/android-2-1-how-do-i-poll-the-rssi-value-of-an-existing-bluetooth-connection http://sourceforge.net/mailarchive/forum.php?forum_name=bluez-devel&style=nested&viewmonth=200505&viewday=17 Most suggestions point to the hci_read_rssi API (int hci_read_rssi(int dd, uint16_t handle, int8_t *rssi, int to);). I am using Python. As a basic skeleton I am using Albert Huang's rfcomm-client.py and rfcomm-server.py scripts. Looking into bluez.py and inquiry-with-rssi.py samples, it helped me to understand how to access the hci layer but I am stuck in execution. This is my script based on rfcomm-server.py: import os, sys, struct, fcntl, array, binascii import btcommon import bluetooth._bluetooth as _bt from bluetooth import * ################################################################# # Added code def get_acl_conn_handle (hci_sock, addr): hci_fd = hci_sock.fileno () reqstr = struct.pack ("6sB17s", _bt.str2ba (addr), _bt.ACL_LINK, "\0" * 17) request = array.array ("c", reqstr) print "ACL_LINK:%s" % _bt.ACL_LINK print "hci_fd:%s" % hci_fd print "HCIGETCONNINFO:%s" % _bt.HCIGETCONNINFO print "request:%s" % request fcntl.ioctl (hci_fd, _bt.HCIGETCONNINFO, request, 1) try: fcntl.ioctl (hci_fd, _bt.HCIGETCONNINFO, request, 1) except IOError, e: raise BluetoothError ("There is no ACL connection to %s" % addr) # XXX should this be "<8xH14x"? handle = struct.unpack ("8xH14x", request.tostring ())[0] return handle ################################################################# server_sock=BluetoothSocket( RFCOMM ) server_sock.bind(("",PORT_ANY)) server_sock.listen(1) port = server_sock.getsockname()[1] uuid = "94f39d29-7d6d-437d-973b-fba39e49d4ee" advertise_service( server_sock, "SampleServer", service_id = uuid, service_classes = [ uuid, SERIAL_PORT_CLASS ], profiles = [ SERIAL_PORT_PROFILE ], # protocols = [ OBEX_UUID ] ) print "Waiting for connection on RFCOMM channel %d" % port client_sock, client_info = server_sock.accept() print "Accepted connection from ", client_info ################################################################# # Added code rssi = 0 handle = get_acl_conn_handle(server_sock._sock, client_info[0]) rssi = bluez.hci_read_rssi(server_sock._sock, handle, rssi, 1000) ################################################################# try: client_sock.send(rssi) print "sent [%s]" % rssi except IOError: pass print "disconnected" client_sock.close() server_sock.close() print "all done" I have added/copied the get_acl_conn_handle function and the call to hci_read_rssi. The problem is that I run into the following exception: Traceback (most recent call last): File "rfcomm-rssi.py", line 48, in <module> handle = get_acl_conn_handle(server_sock._sock, client_info[0]) File "rfcomm-rssi.py", line 16, in get_acl_conn_handle fcntl.ioctl (hci_fd, _bt.HCIGETCONNINFO, request, 1) IOError: [Errno 22] Invalid argument The print statements in get_acl_conn_handle return the following information: ACL_LINK:1 hci_fd:3 HCIGETCONNINFO:-2147202859 request:array('c', '9\x91\x97g\x1d\x1c\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00') I am bit lost on how to fix this. If anyone can help me with my script above or if anyone has sample code in Python or C how to get the RSSI data from a RFCOMM connection then I would highly appreciate it. Thanks in advance, Michael -- 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
