MQTT library returning error connecting to mosquitto

After a little more digging, I noticed I was sending defaults to MQTT and nothing to tinyMQTT.

wifi.dbg() throws unhandled exception

tinyMQTT:

mqtt = require("tinyMQTT").create(server);

mosquitto logs:
1709312245: New client connected from 192.168.1.100:15450 as 29004900-0c513532-39333638 (p2, c0, k65535).

K = keep_alive

MQTT:

mqtt = require("MQTT").create(server, options);
// tried different defaults in the options obj, nothing matters

mosquitto logs:
1709312100: New connection from 192.168.1.100:44568 on port 8883.
1709312100: New client connected from 192.168.1.100:44568 as random (p2, c1, k10).

Summary:

tinyMQTT :
Mosquitto says connected - YES
Espruino says connected - YES
Receive messages - YES

MQTT
Mosquitto says connected - YES
Espruino says connected - NO (Connection Error)
Receive messages - NO

3rd part Android app
Mosquitto says connected - YES
Can publish messages - YES

All using same server and port number