Symptom:
Monitor Protocol fails to decode S1-AP response back to Lattice when mme-service has an underscore in the name of the service.  For example "mme_svc".  The following error is listed in the Monitor Protocol output.

              MMEname Value : 
                | .000 1001 | Length Determinant : 9
                Value : 
                  | 1... .... | Ext bit : 1
                  | .000 0111 | Length Determinant : 7
                    Decode Error: High numbers decoding not supported

Conditions:
This happens only when the mme-service name has an underscore, if you use a dash instead it decodes properly and then Lattice LPS will complete the S1 setup.