The KPN SenML library helps you create and parse senml documents in both json and cbor format. The library can be used for sending sensor data and receiving actuator commands.

Revision:
0:a9259748d982
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/senml_record.cpp	Sat May 19 17:35:20 2018 +0000
@@ -0,0 +1,175 @@
+/*  _  __  ____    _   _ 
+ * | |/ / |  _ \  | \ | |
+ * | ' /  | |_) | |  \| |
+ * | . \  |  __/  | |\  |
+ * |_|\_\ |_|     |_| \_|
+ * 
+ * (c) 2018 KPN
+ * License: MIT License.
+ * Author: Jan Bogaerts
+ * 
+ * record base class 
+ */
+
+#include <senml_record.h>
+#include <senml_helpers.h>
+#include <senml_pack.h>
+#include <cbor.h>
+#include <senml_logging.h>
+
+SenMLRecord::SenMLRecord(const char* name): _name(name), _unit(SENML_UNIT_NONE), _time(NAN), _updateTime(0)
+{
+}
+
+SenMLRecord::SenMLRecord(const char* name, SenMLUnit unit): _name(name), _unit(unit), _time(NAN), _updateTime(0)
+{
+}
+
+bool SenMLRecord::setTime(double value, bool absolute)
+{
+    SenMLBase* root = this->getRoot();
+    if(absolute){
+        if(root){
+            if(root->isPack()){
+                double baseTime = ((SenMLPack*)root)->getBaseTime();
+                if(!isnan(baseTime))
+                    value -= baseTime;
+            }
+            else{
+                return false;
+            }
+        }
+    }
+    else if(root == NULL){
+        return false;
+    }
+    this->_time = value;
+    return true;
+}
+
+bool SenMLRecord::setUpdateTime(double value, bool absolute)
+{
+    SenMLBase* root = this->getRoot();
+    if(absolute){
+        if(root){
+            if(root->isPack()){
+                double baseTime = ((SenMLPack*)root)->getBaseTime();
+                if(!isnan(baseTime))
+                    value -= baseTime;
+            }
+            else{
+                return false;
+            }
+        }
+    }
+    else if(root == NULL){
+        return false;
+    }
+    this->_updateTime = value;
+    return true;
+}
+
+void SenMLRecord::contentToJson()
+{
+    printText("{", 1);
+    this->fieldsToJson();
+    printText("}", 1);
+}
+
+void SenMLRecord::adjustToBaseTime(double prev, double time)
+{
+    if(!isnan(this->_time)){
+        if(!isnan(prev))
+        this->_time += prev;
+        if(!isnan(time))
+            this->_time -= time;
+    }
+    if(!isnan(this->_updateTime)){
+        if(!isnan(prev))
+        this->_updateTime += prev;
+        if(!isnan(time))
+            this->_updateTime -= time;
+    }
+}
+
+void SenMLRecord::fieldsToJson()
+{
+    int bnLength = this->_name.length();
+    if(bnLength){
+        printText("\"n\":\"", 5);
+        printText(this->_name.c_str(), bnLength);
+        printText("\"", 1);
+    }
+    if(!isnan(this->_time)){
+        printText(",\"t\":", 5);
+        printDouble(this->_time, SENML_MAX_DOUBLE_PRECISION);
+    }
+    if(this->_unit != SENML_UNIT_NONE){
+        printText(",\"u\":\"", 6);
+        printUnit(this->_unit);
+        printText("\"", 1);
+    }
+    if(this->_updateTime != 0){
+        printText(",\"ut\":", 5);
+        #ifdef __MBED__
+            char buf[10];
+            sprintf(buf, "%d", this->_updateTime);
+            String val = buf;
+        #else
+            String val(this->_updateTime);
+        #endif
+        printText(val.c_str(), val.length());
+    }
+}
+
+void SenMLRecord::actuate(const void* value, int dataLength, SenMLDataType dataType)
+{
+    log_debug(this->getName());
+    log_debug("no actuator");
+}
+
+int SenMLRecord::contentToCbor()
+{
+    int res = cbor_serialize_map(this->getFieldLength());
+    res += this->fieldsToCbor();
+    return res;
+}
+
+int SenMLRecord::getFieldLength()
+{
+    int result = 1;                                 //always have 1 item for the value
+    if(this->_name.length() > 0) result++;
+    if(!isnan(this->_time)) result++;
+    if(this->_unit != SENML_UNIT_NONE) result++;
+    if(this->_updateTime != 0) result ++;
+    return result;
+}
+
+int SenMLRecord::fieldsToCbor()
+{
+    int res = 0;
+    if(this->_name.length() > 0){
+        res += cbor_serialize_int(SENML_CBOR_N_LABEL);
+        res += cbor_serialize_unicode_string(this->_name.c_str());
+    }
+    if(!isnan(this->_time)){
+        res += cbor_serialize_int(SENML_CBOR_T_LABEL);
+        res += cbor_serialize_double(this->_time);
+    }
+    if(this->_unit != SENML_UNIT_NONE){
+        res += cbor_serialize_int(SENML_CBOR_U_LABEL);
+        res += cbor_serialize_unicode_string(senml_units_names[this->_unit]);
+    }
+    if(this->_updateTime != 0){
+        res += cbor_serialize_int(SENML_CBOR_UT_LABEL);
+        res += cbor_serialize_int(this->_updateTime);
+    }
+    return res;
+}
+
+
+
+
+
+
+