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/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ //! Transmit sensor data to a CoAP server like thethings.io. The CoAP payload will be encoded as JSON. //! The sensor data will be transmitted over NB-IoT. //! Note that we are using a patched version of apps/my_sensor_app/src/vsscanf.c that //! fixes response parsing bugs. The patched file must be present in that location. //! This is the Rust version of `https://github.com/lupyuen/stm32bluepill-mynewt-sensor/blob/rust-nbiot/apps/my_sensor_app/OLDsrc/network.c` use mynewt::{ result::*, // Import Mynewt result and error types hw::sensor::{ // Import Mynewt Sensor API SensorValue, SensorValueType, }, sys::console, // Import Mynewt Console API encoding::coap_context::*, // Import Mynewt Encoding API libs::{ sensor_network, // Import Mynewt Sensor Network API }, coap, d, Strn, // Import Mynewt macros }; use mynewt_macros::strn; // Import Mynewt procedural macros /// Compose a CoAP JSON message with the Sensor Key (field name) and Value in `val` /// and send to the CoAP server. The message will be enqueued for transmission by the CoAP / OIC /// Background Task so this function will return without waiting for the message to be transmitted. /// Return `Ok()` if successful, `SYS_EAGAIN` if network is not ready yet. /// For the CoAP server hosted at thethings.io, the CoAP payload should be encoded in JSON like this: /// ```json /// {"values":[ /// {"key":"device", "value":"0102030405060708090a0b0c0d0e0f10"}, /// {"key":"t", "value":1715} /// ]} /// ``` pub fn send_sensor_data(val: &SensorValue) -> MynewtResult<()> { // Returns an error code upon error. console::print("Rust send_sensor_data\n"); // Get a randomly-generated device ID that changes each time we restart the device. let device_id = sensor_network::get_device_id() ? ; // Start composing the CoAP Server message with the sensor data in the payload. This will // block other tasks from composing and posting CoAP messages (through a semaphore). // We only have 1 memory buffer for composing CoAP messages so it needs to be locked. let rc = sensor_network::init_server_post( strn!(()) ) ? ; // `strn!(())` means use default CoAP URI in `syscfg.yml` // If network transport not ready, tell caller (Sensor Listener) to try again later. if !rc { return Err(MynewtError::SYS_EAGAIN); } // Compose the CoAP Payload using the coap!() macro. // Select @json or @cbor To encode CoAP Payload in JSON or CBOR format. let _payload = coap!( @json { // Create `values` as an array of items under the root. // Append to the `values` array the random device ID: // `{"key":"device", "value":"0102030405060708090a0b0c0d0e0f10"}` "device": &device_id, // Assume `val` contains `key: "t", val: 2870`. // Append to the `values` array the Sensor Key and Sensor Value: // `{"key": "t", "value": 2870}` val, }); // Post the CoAP Server message to the CoAP Background Task for transmission. After posting the // message to the background task, we release a semaphore that unblocks other requests // to compose and post CoAP messages. sensor_network::do_server_post() ? ; // Display the URL with the random device ID for viewing the sensor data. console::print("NET view your sensor at \nhttps://blue-pill-geolocate.appspot.com?device="); console::print_strn(&device_id); console::print("\n"); // The CoAP Background Task will transmit the message in the background. Ok(()) }