Value should be a JSON!

[lexcorp]

In discovery rules I get this error:

Value should be a JSON object.

[cboyer]

Probably an unauthorized character in JSON from a connector/channel name.
Get your JSON with:

• zabbix_get.exe -s YOUR_MIRTH_IP -p MIRTHIX_PORT -k mirth.discovery.channel
• zabbix_get.exe -s YOUR_MIRTH_IP -p MIRTHIX_PORT -k mirth.discovery.connector

Don't forget to allow your IP to query Mirthix (cf. README).
You can parse it with online tools or paste it here so I can inspect data and publish a fix to escape or filter some characters.
You can get zabbix_get.exe at https://www.zabbix.com/download_agents (archive).

[lexcorp]

I get this message:

zabbix_get.exe [10980]: Check access restrictions in Zabbix agent configuration

[cboyer]

Did you allowed your IP in Mirthix to be able to query the channel? (Source Filter > Rule Builder)
What's the Mirth and Zabbix version?

[lexcorp]

Mirth version: 3.7.1
Zabbix version: 4.0.22

[lexcorp]

[cboyer]

Change value 127.0.0.1 to your Zabbix server IP, save and redeploy channel.