fetaure of adding client-token in UUIDv4 format value via env variable or via -l commandline para same as access-token

[mayurpatel-kaercher]

Motivation

• Please give a brief description for the background of this change. Hi All, Due to recent changes from AWS-Secure-Tunneling feature we are not able to reuse the tunnel till we provide a client-token in UUIDV4 format so that sever can remember it for the next time. In this PR we have implemented that feature. We have already created issues and asked about it in the past.

• References: https://github.com/aws-samples/aws-iot-securetunneling-localproxy/blob/eb951de124cabfc2f7d373407556896ac805c935/V2WebSocketProtocolGuide.md?plain=1#L45

• Issue number:

  85

  84

Modifications

Change summary

• most of changes are similarly implanted as previous client-access-token (taken as reference)
• just added new parameter client-token which can be also passed from outside (command-line OR env-variable)
• that client-token will be added to the end of HTTP request same as access-token.
• that's it.

Testing

Is your change tested? Yes.

Please list your testing steps and test results.

• connected the mqtt-client
• created a new Secure-Tunnel
• got the access-token
• generated new client-token in UUIDV4 format
• supplied all the para in described format like given below
• repeated the same process again after disconnecting localproxy many times and it works. (previously it was not possible to reconnect after you disconnect for the first time.)

# via Commandline 
./localproxy  -r eu-west-1 -d 22 -t xxxxxxxxxxxxxxxxxxxxxxxxxxx -l 514c075b-a407-4d59-9bce-cb82e5e75868

# via Env Variable
AWSIOT_TUNNEL_CLIENT_TOKEN=514c075b-a407-4d59-9bce-cb82e5e75869  AWSIOT_TUNNEL_CLIENT_TOKEN=xxxxxxxxxxxxxxxxxxxxxxxxxxx ./localproxy  -r eu-west-1 -d 22

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[shangabl]

Hi mayurpatel-kaercher,

I'm sorry that this PR was overlooked by our team! I recently merged a change adding the same functionality.

Thank you for your time on this. Please don't hesitate to contribute in the future.