Added ents_proto example

examples/ents_proto/Makefile

@@ -0,0 +1,11 @@
+# Makefile for user application
+
+# Specify this directory relative to the current application.
+TOCK_USERLAND_BASE_DIR = ../..
+
+# Which files to compile.
+C_SRCS := $(wildcard *.c)
+
+# Include userland master makefile. Contains rules and flags for actually
+# building the application.
+include $(TOCK_USERLAND_BASE_DIR)/AppMakefile.mk

examples/ents_proto/README.md

@@ -0,0 +1,7 @@
+ENTS Protobuf Example
+=========
+
+App includes the necessary source files and demonstrates how to encode a repeated sensor measurement command with TEROS12 data.
+
+Files are copied from [ents-firmware repo](https://github.com/jlab-sensing/ENTS-node-firmware/tree/c5c7d364068dc00ec7cdce562b29ab6a69ed8ca6/proto/c). This repo has additional documentation on implementation and usage. In the future we will setup a library that automatically gets upstream updates.
+

examples/ents_proto/main.c

@@ -0,0 +1,50 @@
+#include <libtock-sync/services/alarm.h>
+
+#include "sensor.h"
+
+int main(void) {
+  uint8_t buffer[256] = {};
+  size_t buffer_len   = 0;
+
+  // float vwc_adj = (3.879e-4 * sens_data.vwc) - 0.6956;
+
+  // metadata
+  // 200 for logger_id and cell_id  are known to exist
+  // should change to newly created cells on dirtviz
+  Metadata meta = Metadata_init_zero;
+  meta.ts        = 1769113673;
+  meta.logger_id = 200;
+  meta.cell_id   = 200;
+
+  SensorMeasurement meas[4] = {};
+
+  // vwc measurements
+  SensorMeasurement* vwc_raw = &meas[0];
+  vwc_raw->type          = SensorType_TEROS12_VWC;
+  vwc_raw->which_value   = SensorMeasurement_decimal_tag;
+  vwc_raw->value.decimal = 2000.;
+
+  SensorMeasurement* vwc_adj = &meas[1];
+  vwc_adj->type          = SensorType_TEROS12_VWC_ADJ;
+  vwc_adj->which_value   = SensorMeasurement_decimal_tag;
+  vwc_adj->value.decimal = 20.;
+
+  SensorMeasurement* temp = &meas[2];
+  temp->type          = SensorType_TEROS12_TEMP;
+  temp->which_value   = SensorMeasurement_decimal_tag;
+  temp->value.decimal = 22.;
+
+  SensorMeasurement* ec = &meas[3];
+  ec->type               = SensorType_TEROS12_EC;
+  ec->which_value        = SensorMeasurement_unsigned_int_tag;
+  ec->value.unsigned_int = 20.;
+
+  SensorStatus status = SENSOR_OK;
+  status = EncodeRepeatedSensorMeasurements(meta, meas, sizeof(meas), buffer, sizeof(buffer), &buffer_len);
+  if (status != SENSOR_OK) {
+    // ERROR in formatting or buffer
+    return -1;
+  }
+
+  return 0;
+}