Generic improvements and bugfixes

Additions and Improvements

v1.6

• Changed the StopTransactionRequest.MeterStop field to allow negative values

OCPP-J

• Added a onDisconnectedHandler callback to the Client struct, which allows to be notified if a connection is interrupted and the dispatcher paused
• Added a onReconnectedHandler callback to the Client struct, which allows to be notified when a connection is re-established and the dispatcher resumed
• Added a timeout option for outgoing server requests: if a response is not received within the configured timeframe, the request is discarded and an error is returned to the sender. The feature is available by invoking the SetTimeout method on a ServerDispatcher
• Added support for disabling message validation entirely, via the SetMessageValidation package function
• Added support for verbose logging (using an optional logging.Logger)

Websockets

• Added a RemoteAddr function to websockets for retrieving the address of the remote host
• Added support for disabling ping/pong mechanism, by setting PingWait = 0 within the timeout configuration
• Added support for verbose logging (using an optional logging.Logger)

Generic

• Moved logging interfaces to a dedicated ocpp-go/logging package

Bugfixes

• Fixed a bug that occurred when sending messages over a closed websocket channel
• Fixed a bug that would deadlock a newly created websocket, if the NewClientHandler callback contained blocking code
• Fixed several other race conditions in the ocpp-j layer
• Fixed a crash caused by incoming empty json requests/responses
• Fixed a crash caused by incoming OCCP errors not containing a description field
• Fixed the default subprotocol for v2 to be ocpp2.0.1