Cellular: Added ATHandler option to write parameters without delimiters

Author: Mirela Chirica

features/cellular/framework/AT/ATHandler.cpp

@@ -81,6 +81,7 @@ ATHandler::ATHandler(FileHandle *fh, EventQueue &queue, int timeout, const char
     _max_resp_length(MAX_RESP_LENGTH),
     _debug_on(MBED_CONF_CELLULAR_DEBUG_AT),
     _cmd_start(false),
+    _use_delimiter(true),
     _start_time(0)
 {
     clear_error();
@@ -612,6 +613,11 @@ void ATHandler::set_default_delimiter()
     _delimiter = DEFAULT_DELIMITER;
 }
 
+void ATHandler::use_delimiter(bool use_delimiter)
+{
+    _use_delimiter = use_delimiter;
+}
+
 void ATHandler::set_tag(tag_t *tag_dst, const char *tag_seq)
 {
     if (tag_seq) {
@@ -1147,6 +1153,11 @@ bool ATHandler::check_cmd_send()
         return false;
     }
 
+    // Don't write delimiter if flag was set so
+    if (!_use_delimiter) {
+        return true;
+    }
+
     // Don't write delimiter if this is the first subparameter
     if (_cmd_start) {
         _cmd_start = false;

features/cellular/framework/AT/ATHandler.h

@@ -281,6 +281,12 @@ class ATHandler {
      */
     void set_default_delimiter();
 
+    /** Defines behaviour for using or ignoring the delimiter within an AT command
+     *
+     *  @param use_delimiter indicating if delimiter should be used or not
+     */
+    void use_delimiter(bool use_delimiter);
+
     /** Consumes the reading buffer up to the delimiter or stop_tag
      *
      *  @param count number of parameters to be skipped
@@ -435,6 +441,7 @@ class ATHandler {
     char _info_resp_prefix[BUFF_SIZE];
     bool _debug_on;
     bool _cmd_start;
+    bool _use_delimiter;
 
     // time when a command or an URC processing was started
     uint64_t _start_time;

features/cellular/framework/AT/AT_CellularNetwork.cpp

@@ -386,9 +386,11 @@ nsapi_error_t AT_CellularNetwork::open_data_channel()
         _at.write_int(_cid);
     } else {
         MBED_ASSERT(_cid >= 0 && _cid <= 99);
-        char cmd_buf[sizeof("ATD*99***xx#")];
-        std::sprintf(cmd_buf, "ATD*99***%d#", _cid);
-        _at.cmd_start(cmd_buf);
+        _at.cmd_start("ATD*99***");
+        _at.use_delimiter(false);
+        _at.write_int(_cid);
+        _at.write_string("#", false);
+        _at.use_delimiter(true);
     }
     _at.cmd_stop();