Password machinery

[juangallostra]

Feature / Bug description

1. Allow the user to set a password for the Mosquito that has been connected via USB. This is to prevent other users with access to the Mosquito WiFi from executing the missions loaded in a specific Mosquito. The MSP message ID used to do so is 213 and the password will consist in 4 characters, which will be the payload of the message (4 bytes).

2. Allow the user to validate a password. Once the password has been set several actions will require the user to enter the password of the Mosquito. Once this password has been entered the firmware should validate it. To trigger this action, an MSP message with ID 214 and a payload of 4 bytes - containing the entered password - will be used.

3. Enable retrieving the result of the password validation. A third MSP message (ID 117) will be used to retrieve the result of the validation performed in 2. This MSP message will have a payload of 1 byte. A value of 0 will indicate that validation failed and a value of 1 that the validation was successful.

Expected behavior

1. A password can be set for each Mosquito.
2. Password validation can be performed.
3. The result of a password validation request can be retrieved.

Related bonadrone platform issue

https://bitbucket.org/bonadrone_project/platform/issues/6/release-2-set-drone-password

[juangallostra]

Maybe we should implement the following logic: in order to execute any command received through WiFi the password must have been validated first.