feat(go): publish expanded local measures

components/airgradient-client/README.md

@@ -121,8 +121,8 @@ average.
 | PM standard mass | `pm01Standard`, `pm02Standard`, `pm10Standard` | 1 decimal |
 | PM particle counts | `pm003Count`, `pm005Count`, `pm01Count`, `pm02Count`, `pm50Count`, `pm10Count` | Integer |
 | TVOC / NOx | `tvocIndex`, `tvocRaw`, `noxIndex`, `noxRaw` | Integer |
-| Power | `volt`, `light` | Unrounded float |
-| O3 / NO2 electrodes | `measure0` through `measure4` | Unrounded float |
+| Power | `volt`, `light` | 2 decimals |
+| O3 / NO2 electrodes | `measure0` through `measure4` | 3 decimals |
 
 Particle-count units follow the shared `PMData` convention: counts are
 stored as particles per 0.1 L before they reach this serializer. Drivers
@@ -168,9 +168,7 @@ reachable deterministically on hardware and rely on the host tests.
 ## Not Yet Implemented
 
 The following methods are present on `AgClient`'s public API so call
-sites can be wired today, but they currently fail loudly. The full
-design for each lives in [`spec.md`](spec.md), which will be deleted
-once this work lands.
+sites can be wired today, but they currently fail loudly.
 
 - `begin(sn, NetworkType::Cellular, modem)` — returns `false` and logs
 - `coap_fetch_config()` / `coap_post_measures()` — abort

components/airgradient-client/services/payload_serializer.cpp

@@ -48,16 +48,10 @@ constexpr const char *JSON_PROP_AFE_TEMP = "measure4";
 constexpr int DECIMALS_INT = 0;
 constexpr int DECIMALS_PM_MASS = 1;
 constexpr int DECIMALS_TEMP_HUM = 2;
+constexpr int DECIMALS_VOLT = 2;
+constexpr int DECIMALS_ELECTRODE = 3;
 
-inline void add_int(cJSON *obj, const char *name, int value) {
-  cJSON_AddNumberToObject(obj, name, static_cast<double>(value));
-}
-
-inline void add_float(cJSON *obj, const char *name, float value) {
-  cJSON_AddNumberToObject(obj, name, static_cast<double>(value));
-}
-
-// Round-half-away-from-zero to `decimals` places.  decimals==0 yields an
+// Round-half-away-from-zero to `decimals` places. decimals==0 yields an
 // integer-valued double, which cJSON prints without a decimal point.
 inline double round_to_decimals(double value, int decimals) {
   switch (decimals) {
@@ -67,11 +61,21 @@ inline double round_to_decimals(double value, int decimals) {
     return std::round(value * 10.0) / 10.0;
   case 2:
     return std::round(value * 100.0) / 100.0;
+  case 3:
+    return std::round(value * 1000.0) / 1000.0;
   default:
     return value;
   }
 }
 
+inline void add_int(cJSON *obj, const char *name, int value) {
+  cJSON_AddNumberToObject(obj, name, static_cast<double>(value));
+}
+
+inline void add_float(cJSON *obj, const char *name, float value, int decimals) {
+  cJSON_AddNumberToObject(obj, name, round_to_decimals(static_cast<double>(value), decimals));
+}
+
 // Mean if both valid, single value if one, omit if neither.  Rounded to
 // `decimals` places after the dual-channel reduction so the JSON output
 // matches the server-side numeric contract.
@@ -198,10 +202,10 @@ void serialize_power(cJSON *obj, const MeasuresPower *p) {
     return;
   }
   if (p->is_battery_voltage_valid()) {
-    add_float(obj, JSON_PROP_VBATT, p->battery_voltage);
+    add_float(obj, JSON_PROP_VBATT, p->battery_voltage, DECIMALS_VOLT);
   }
   if (p->is_charging_voltage_valid()) {
-    add_float(obj, JSON_PROP_VPANEL, p->charging_voltage);
+    add_float(obj, JSON_PROP_VPANEL, p->charging_voltage, DECIMALS_VOLT);
   }
 }
 
@@ -210,19 +214,19 @@ void serialize_electrode(cJSON *obj, const O3No2Data *e) {
     return;
   }
   if (e->is_o3_working_valid()) {
-    add_float(obj, JSON_PROP_O3_WE, e->o3_we);
+    add_float(obj, JSON_PROP_O3_WE, e->o3_we, DECIMALS_ELECTRODE);
   }
   if (e->is_o3_auxiliary_valid()) {
-    add_float(obj, JSON_PROP_O3_AE, e->o3_ae);
+    add_float(obj, JSON_PROP_O3_AE, e->o3_ae, DECIMALS_ELECTRODE);
   }
   if (e->is_no2_working_valid()) {
-    add_float(obj, JSON_PROP_NO2_WE, e->no2_we);
+    add_float(obj, JSON_PROP_NO2_WE, e->no2_we, DECIMALS_ELECTRODE);
   }
   if (e->is_no2_auxiliary_valid()) {
-    add_float(obj, JSON_PROP_NO2_AE, e->no2_ae);
+    add_float(obj, JSON_PROP_NO2_AE, e->no2_ae, DECIMALS_ELECTRODE);
   }
   if (e->is_afe_temp_valid()) {
-    add_float(obj, JSON_PROP_AFE_TEMP, e->afe_temp);
+    add_float(obj, JSON_PROP_AFE_TEMP, e->afe_temp, DECIMALS_ELECTRODE);
   }
 }