I took the Trinket out of the equation and connected the SIM800L EVB to a USB UART adaptor and attempted to talk directly to the MODEM. It was somewhat successful to the point of sending the actual message. This could be just a formatting issue i.e. with the CR/LF Vs message length.
Again the status lights on the SIM800L EVB changed their pattern. So a description on what it is trying to tell me would be good. From the response of the MODEM, it seems it could at least make a connection.
The dialogue went along these lines (some IP address information I have replaced with “x”.
1, CONNECT OK
1, SEND FAIL