Managed to replicate the error you have in my installation.
Code:
L 08/18/2020 - 00:53:31: [gRIP] Error: FFI Error: URI parsing error: http/api/messages
Caused by: relative URL without a base
This is caused if the cvar value is not in quotes.
Code:
amx_matter_bridge_url http://[your matterbridge ip]:[port]
Change it to
Code:
amx_matter_bridge_url "http://[your matterbridge ip]:[port]"
Apache is not required.
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