8.5.4 Message Flow
Below are some examples of typical message flows for various interactions with the sensor.
Discovery of a Sensor
1. PC broadcasts a DISCOVER message
Only the header values need to be filled
• Protocol ID field should be set to 0x6956752b, “iVu+"
• Message Type field should be set to 0x44495343, “DISC”
• Correlation tag should be set by the sender to the non-zero value that will allow the sender
to identify the response.
The packet with the header values is sent out using the broadcast address of 255.255.255.255
NOTE: Not all the switches are configured to pass broadcast packets by default. A switch
configuration change may be necessary to enable the passing of broadcast packets.
2. Upon receipt of the broadcast message the sensor performs the following:
Sensor verifies that the message is addressed to it by comparing Protocol ID field to value 0x6956752b.
• If the value matches, the sensor examines the Message Type field.
> If the value does not match any of the commands, the sensor discards the packet.
> If the Message Type field matches 0x44495343, “DISC”, the sensor prepares the response
in the form of DISCOVER_REPLY packet:
- Protocol ID field is again set to 0x6956752b, “iVu+”
- Message Type field is set to 0x52504c59, “RPLY”
- Correlation Tag is copied from the received message
- Body of the message is populated with the following fields, with fields separated
by a comma:
iVu Plus TG Gen2 Image Sensor
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