Protocol by Gurtam that proxies raw data to target servers (up to 3 destinations) via TCP and/or stores raw data in channel messages (read more in a dedicated article). Also, the proxy channel has a nice binary/text traffic viewer integrated into Toolbox.
To enable the proxy mode add one or more targets. Targets may be optionally marked as mandatory.
For mandatory targets: if a connection fails, the channel throws an error and drops an input connection.
For non-mandatory targets: if a connection fails, the channel continues data transmission to other targets.
If 'proxy replies' option is enabled, the channel will transmit replies from the corresponding target to the channel's input connection.
If enabled, raw data packets are saved in channel messages as the 'proxy.payload.hex' parameter. If the payload size exceeds 2MB, the parameter is not registered. If target replies are enabled, then target response packets are also saved as the 'proxy.payload.hex' parameter in channel messages.
If neither store mode nor proxy mode is enabled, the channel simply skips the data from the input connection.
Note: However, the channel will always save diagnostic messages about each connection opened/closed event.
The following parameters are registered in channel messages and may be used to diagnose channel issues:
peer — the channel's incoming connection ip:port.
proxy.event — the channel event:
- 0 — data received (if store mode enabled, messages of this type will include data in 'proxy.payload.hex')
- 1 — connection established
- 2 — connection dropped
proxy.source — attributes a message to a particular connection:
- 0 — event in the channel's incoming connection
- 1 — event in target 1
- 2 — event in target 2, etc.
ID of channel that received a message
ID of device that received a message
Name of device that received a message
ID of device type of device that received a message
Device unique identifier like serial number, IMEI, etc
IP:port from which device connecting to the channel
ID of protocol
Channel event type: 0 - data received, 1 - connect, 2 - disconnect
Data received, in HEX format
Size of data packet
Message source: 0 - channel incoming connection, 1 - target1, 2 - target2, etc
Timestamp when server received a message