Bug 788928 - Part 1/5: allow extra unsolicited response in AT command handlers
Bug 788928 - Part 2/5: support SMS variable message reference & console command
Bug 788928 - Part 3/5: add sms cmse/drpt console commands
Bug 788928 - Part 4/5: send delivery status report
Bug 788928 - Part 5/5: send CMS ERROR