Wrong log message for received json

[Legion2]

Describe the bug
The logJson function is used by receivingMQTT and pub, to log the json which is send and received.
However, the log message text is always Received json : %s.
This means also when sending json, in the logs it shows as received json.

To Reproduce
Steps to reproduce the behavior:

1. Open the serial monitor
2. Wait for SYStoMQTT
3. See wrong log message

Expected behavior
The log message should either indicate the correct action (sending, receiving) or exclude this information from the log.

Screenshots

N: Subject: /SYStoMQTT
N: Received json : {"uptime":1803,"version":"v0.9.6","freemem":206120,...}
T: jsonPublishing

Environment:

• OpenMQTTGateway version: development

Additional context
I use log level LOG_LEVEL_VERBOSE.

[stale]

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