def discover_devices(ip_address = None):
global device_list, the_first_device, mac_byte_map, ip_address_map
# Reset all maps and lists
device_list = []
ip_address_map = {}
mac_byte_map = {}
# First create the initial device for discovery.
# If our client wants to discover devices only on a specific IP address,
# use that to create a new broadcast device.
if (ip_address != None):
specified_device = Device(
ip_address = ip_address,
id = CHAIN_INITIATOR_ID,
frame_size_limit = MIN_FRAME_SIZE,
client_socket = client_socket)
try:
frame_list = specified_device.send_frame(DISCOVER_REQUEST);
except RuntimeError, e:
print(str(e))
raise DeviceError("No reponse to discover frame.")
# use that to create a new broadcast device.
if (ip_address != None):
specified_device = Device(
ip_address = ip_address,
id = CHAIN_INITIATOR_ID,
frame_size_limit = MIN_FRAME_SIZE,
client_socket = client_socket)
try:
frame_list = specified_device.send_frame(DISCOVER_REQUEST);
except RuntimeError, e:
print(str(e))
raise DeviceError("No reponse to discover frame.")
else:
# Otherwise use normal broadcast device
try:
frame_list = broadcast_device.send_frame(DISCOVER_REQUEST);
except RuntimeError, e:
print(str(e))
raise DeviceError("No reponse to discover frame.")
# Then parse the replies from the discovery request to find out the
# IP addresses and MAC bytes of each device.
for reply in frame_list:
firmware_version = (reply.major_version, reply.minor_version)
# If returned firmware version is not found, default is min frame size.
frame_size_limit = MIN_FRAME_SIZE
if (sequencer.firmware.FIRMWARE_PARAMS.has_key(firmware_version)):
params = sequencer.firmware.FIRMWARE_PARAMS[firmware_version]
frame_size_limit = params.frame_size_limit
