A catch-all for a failure the agent cannot describe more precisely. It carries no diagnostic information by design.
This is a transport failure, so there is nothing for Forge to normalize: the reading never arrives. What Forge does is refuse to let the gap look like good data. The read-time dropout check flags a field that fell to zero and recovered as a communication glitch rather than a real measurement, and the stuck-sensor check fires when a value repeats for 20 consecutive readings — which is what a cached or last-known value looks like after a link drops. Forge does not retry or reconnect for you; that is your client's or your gateway's job.
One MCP endpoint serves every protocol adapter. 16,908 curated mappings, 366 canonical fields.
Other SNMP codes: noSuchName tooBig authorizationError
Other protocols: Modbus OPC UA MQTT / Sparkplug B FANUC FOCAS EtherNet/IP PROFINET / S7 BACnet/IP J1939 (CAN) MTConnect ROS 2 (DDS) MAVLink HTTP / REST CSV ingest