fixup! adding prompt verification

Author: andreagilardoni

libraries/WiFiS3/src/Modem.cpp

@@ -235,12 +235,15 @@ ModemClass::ParseResult ModemClass::buf_read(const string &prompt, string &data_
             if(c == ':' || c == '=') {
                commandName += c; // prompt includes also ':'
 
-               if (commandName != DO_NOT_CHECK_CMD && commandName != prompt) {
-                  // state = at_parse_state_t::Begin; // TODO decide whether to return ParseError or realign
+               if (prompt != DO_NOT_CHECK_CMD && commandName != prompt) {
+                  // the response we got is not the one we were expecting, parse the wrong response till the end
+                  // and start the parse of the next response
                   restart = true;
-               } else {
-                  state = at_parse_state_t::Data;
+                  commandName = "";
                }
+               state = at_parse_state_t::Data;
+
+               data_res = "";
                // state = at_parse_state_t::Data;
             } else if(c != ' ') { // FIXME should we keep the space?
                commandName += c;
@@ -330,6 +333,7 @@ ModemClass::ParseResult ModemClass::buf_read(const string &prompt, string &data_
 
                if(restart) {
                   state = at_parse_state_t::Begin;
+                  restart = false;
                } else {
                   state = at_parse_state_t::Completed;
                }
@@ -349,6 +353,7 @@ ModemClass::ParseResult ModemClass::buf_read(const string &prompt, string &data_
 
                if(restart) {
                   state = at_parse_state_t::Begin;
+                  restart = false;
                } else {
                   state = at_parse_state_t::Completed;
                }
@@ -358,6 +363,7 @@ ModemClass::ParseResult ModemClass::buf_read(const string &prompt, string &data_
             res = ParseError;
             if(restart) {
                state = at_parse_state_t::Begin;
+               restart = false;
             } else {
                state = at_parse_state_t::Completed;
             }