ARM mbed M2X API Client: The ARM mbed client library is used to send/receive data to/from AT&T's M2X service from mbed LPC1768 microcontrollers.
Dependents: m2x-demo-all M2X_MTS_ACCEL_DEMO M2X_MTS_Accel M2X_K64F_ACCEL ... more
Revision 5:ea68c8980ad8, committed 2013-10-24
- Comitter:
- citrusbyte
- Date:
- Thu Oct 24 12:22:33 2013 +0000
- Child:
- 6:e6d66d99dd6f
- Commit message:
- Initial commit for M2X mbed client library
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Client.cpp Thu Oct 24 12:22:33 2013 +0000 @@ -0,0 +1,61 @@ +#include "Client.h" +#include "mbed.h" + +#include <stdint.h> + +Client::Client() : _len(0), _sock() { +} + +Client::~Client() { +} + +int Client::connect(const char *host, uint16_t port) { + return _sock.connect(host, port) == 0; +} + +size_t Client::write(uint8_t b) { + return write(&b, 1); +} + +size_t Client::write(const uint8_t *buf, size_t size) { + _sock.set_blocking(false, 15000); + // NOTE: we know it's dangerous to cast from (const uint8_t *) to (char *), + // but we are trying to maintain a stable interface between the Arduino + // one and the mbed one. What's more, while TCPSocketConnection has no + // intention of modifying the data here, it requires us to send a (char *) + // typed data. So we belive it's safe to do the cast here. + return _sock.send_all(const_cast<char*>((const char*) buf), size); +} + +int Client::available() { + if (_len > 0) { return 1; } + int ret = read(_buf, 1); + if (ret <= 0) { return 0; } + _len = ret; + return 1; +} + +int Client::read() { + if (_len > 0) { + _len = 0; + return _buf[0]; + } + return -1; +} + +int Client::read(uint8_t *buf, size_t size) { + return _sock.receive_all((char*) buf, size); +} + +void Client::flush() { + // does nothing, TCP stack takes care of this +} + +void Client::stop() { + _sock.close(); +} + +uint8_t Client::connected() { + return _sock.is_connected(); +} +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Client.h Thu Oct 24 12:22:33 2013 +0000 @@ -0,0 +1,31 @@ +#ifndef Client_h +#define Client_h + +#include "Print.h" +#include "TCPSocketConnection.h" + +/* + * TCP Client + */ +class Client : public Print { +public: + Client(); + ~Client(); + + virtual int connect(const char *host, uint16_t port); + virtual size_t write(uint8_t); + virtual size_t write(const uint8_t *buf, size_t size); + virtual int available(); + virtual int read(); + virtual void flush(); + virtual void stop(); + virtual uint8_t connected(); +private: + virtual int read(uint8_t *buf, size_t size); + uint8_t _buf[1]; + uint8_t _len; + TCPSocketConnection _sock; +}; + +#endif +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/LocationParseFunctions.h Thu Oct 24 12:22:33 2013 +0000 @@ -0,0 +1,102 @@ +#ifndef LocationParseFunctions_h +#define LocationParseFunctions_h + +// Data structures and functions used to parse locations + +#define LOCATION_BUF_LEN 20 + +typedef struct { + uint16_t state; + char name_str[LOCATION_BUF_LEN + 1]; + double latitude; + double longitude; + double elevation; + char timestamp_str[LOCATION_BUF_LEN + 1]; + int index; + + location_read_callback callback; + void* context; +} location_parsing_context_state; + +#define WAITING_NAME 0x1 +#define WAITING_LATITUDE 0x2 +#define WAITING_LONGITUDE 0x4 +#define WAITING_ELEVATION 0x8 +#define WAITING_TIMESTAMP 0x10 + +#define GOT_NAME 0x20 +#define GOT_LATITUDE 0x40 +#define GOT_LONGITUDE 0x80 +#define GOT_ELEVATION 0x100 +#define GOT_TIMESTAMP 0x200 + +#define GOT_LOCATION (GOT_NAME | GOT_LATITUDE | GOT_LONGITUDE | GOT_ELEVATION | GOT_TIMESTAMP) +#define TEST_GOT_LOCATION(state_) (((state_) & GOT_LOCATION) == GOT_LOCATION) + +#define TEST_IS_NAME(state_) (((state_) & (WAITING_NAME | GOT_NAME)) == WAITING_NAME) +#define TEST_IS_LATITUDE(state_) (((state_) & (WAITING_LATITUDE | GOT_LATITUDE)) \ + == WAITING_LATITUDE) +#define TEST_IS_LONGITUDE(state_) (((state_) & (WAITING_LONGITUDE | GOT_LONGITUDE)) \ + == WAITING_LONGITUDE) +#define TEST_IS_ELEVATION(state_) (((state_) & (WAITING_ELEVATION | GOT_ELEVATION)) \ + == WAITING_ELEVATION) +#define TEST_IS_TIMESTAMP(state_) (((state_) & (WAITING_TIMESTAMP | GOT_TIMESTAMP)) \ + == WAITING_TIMESTAMP) + +static void on_location_key_found(jsonlite_callback_context* context, + jsonlite_token* token) { + location_parsing_context_state* state = + (location_parsing_context_state*) context->client_state; + if (strncmp((const char*) token->start, "waypoints", 9) == 0) { + // only parses those locations in waypoints, skip the outer one + state->state = 0; + } else if (strncmp((const char*) token->start, "name", 4) == 0) { + state->state |= WAITING_NAME; + } else if (strncmp((const char*) token->start, "latitude", 8) == 0) { + state->state |= WAITING_LATITUDE; + } else if (strncmp((const char*) token->start, "longitude", 9) == 0) { + state->state |= WAITING_LONGITUDE; + } else if (strncmp((const char*) token->start, "elevation", 9) == 0) { + state->state |= WAITING_ELEVATION; + } else if (strncmp((const char*) token->start, "timestamp", 9) == 0) { + state->state |= WAITING_TIMESTAMP; + } +} + +static void on_location_string_found(jsonlite_callback_context* context, + jsonlite_token* token) { + location_parsing_context_state* state = + (location_parsing_context_state*) context->client_state; + + if (TEST_IS_NAME(state->state)) { + strncpy(state->name_str, (const char*) token->start, + MIN(token->end - token->start, LOCATION_BUF_LEN)); + state->name_str[MIN(token->end - token->start, LOCATION_BUF_LEN)] = '\0'; + state->state |= GOT_NAME; + } else if (TEST_IS_LATITUDE(state->state)) { + state->latitude = atof((const char*) token->start); + state->state |= GOT_LATITUDE; + } else if (TEST_IS_LONGITUDE(state->state)) { + state->longitude = atof((const char*) token->start); + state->state |= GOT_LONGITUDE; + } else if (TEST_IS_ELEVATION(state->state)) { + state->elevation = atof((const char*) token->start); + state->state |= GOT_ELEVATION; + } else if (TEST_IS_TIMESTAMP(state->state)) { + strncpy(state->timestamp_str, (const char*) token->start, + MIN(token->end - token->start, LOCATION_BUF_LEN)); + state->timestamp_str[MIN(token->end - token->start, LOCATION_BUF_LEN)] = '\0'; + state->state |= GOT_TIMESTAMP; + } + + if (TEST_GOT_LOCATION(state->state)) { + state->callback(state->name_str, state->latitude, state->longitude, + state->elevation, state->timestamp_str, state->index++, + state->context); + state->state = 0; + } +} + +#endif /* LocationParseFunctions_h */ + +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/M2XStreamClient.cpp Thu Oct 24 12:22:33 2013 +0000 @@ -0,0 +1,584 @@ +#include "M2XStreamClient.h" + +#include <jsonlite.h> + +#include "StreamParseFunctions.h" +#include "LocationParseFunctions.h" + +#define HEX(t_) ((char) (((t_) > 9) ? ((t_) - 10 + 'A') : ((t_) + '0'))) +#define MAX_DOUBLE_DIGITS 7 + +const char* M2XStreamClient::kDefaultM2XHost = "api-m2x.att.com"; +const char* kUserAgentLine = "User-Agent: M2X Arduino Client/0.1"; + +static int print_encoded_string(Print* print, const char* str); + +M2XStreamClient::M2XStreamClient(Client* client, + const char* key, + const char* host, + int port) : _client(client), + _key(key), + _host(host), + _port(port), + _null_print() { +} + +int M2XStreamClient::send(const char* feedId, + const char* streamName, + double value) { + if (_client->connect(_host, _port)) { +#ifdef DEBUG + printf("Connected to M2X server!\n"); +#endif + writeSendHeader(feedId, streamName, + // 6 for "value=" + _null_print.print(value) + 6); + _client->print("value="); + // value is a double, does not need encoding + _client->print(value); + } else { +#ifdef DEBUG + printf("ERROR: Cannot connect to M2X server!\n"); +#endif + return E_NOCONNECTION; + } + + return readStatusCode(true); +} + +int M2XStreamClient::send(const char* feedId, + const char* streamName, + long value) { + if (_client->connect(_host, _port)) { +#ifdef DEBUG + printf("Connected to M2X server!\n"); +#endif + writeSendHeader(feedId, streamName, + // 6 for "value=" + _null_print.print(value) + 6); + + _client->print("value="); + // value is a long, does not need encoding + _client->print(value); + } else { +#ifdef DEBUG + printf("ERROR: Cannot connect to M2X server!\n"); +#endif + return E_NOCONNECTION; + } + + return readStatusCode(true); +} + +int M2XStreamClient::send(const char* feedId, + const char* streamName, + int value) { + if (_client->connect(_host, _port)) { +#ifdef DEBUG + printf("Connected to M2X server!\n"); +#endif + writeSendHeader(feedId, streamName, + // 6 for "value=" + _null_print.print(value) + 6); + + _client->print("value="); + // value is an int, does not need encoding + _client->print(value); + } else { +#ifdef DEBUG + printf("ERROR: Cannot connect to M2X server!\n"); +#endif + return E_NOCONNECTION; + } + + return readStatusCode(true); +} + +int M2XStreamClient::send(const char* feedId, + const char* streamName, + const char* value) { + if (_client->connect(_host, _port)) { +#ifdef DEBUG + printf("Connected to M2X server!\n"); +#endif + writeSendHeader(feedId, streamName, + // 6 for "value=" + _null_print.print(value) + 6); + + _client->print("value="); + print_encoded_string(_client, value); + } else { +#ifdef DEBUG + printf("ERROR: Cannot connect to M2X server!\n"); +#endif + return E_NOCONNECTION; + } + + return readStatusCode(true); +} + +int M2XStreamClient::receive(const char* feedId, const char* streamName, + stream_value_read_callback callback, void* context) { + if (_client->connect(_host, _port)) { +#ifdef DEBUG + printf("Connected to M2X server!\n"); +#endif + _client->print("GET /v1/feeds/"); + print_encoded_string(_client, feedId); + _client->print("/streams/"); + print_encoded_string(_client, streamName); + _client->println("/values HTTP/1.0"); + + writeHttpHeader(-1); + } else { +#ifdef DEBUG + printf("ERROR: Cannot connect to M2X server!\n"); +#endif + return E_NOCONNECTION; + } + int status = readStatusCode(false); + if (status == 200) { + readStreamValue(callback, context); + } + + close(); + return status; +} + +int M2XStreamClient::readLocation(const char* feedId, + location_read_callback callback, + void* context) { + if (_client->connect(_host, _port)) { +#ifdef DEBUG + printf("Connected to M2X server!\n"); +#endif + _client->print("GET /v1/feeds/"); + print_encoded_string(_client, feedId); + _client->println("/location HTTP/1.0"); + + writeHttpHeader(-1); + } else { +#ifdef DEBUG + printf("ERROR: Cannot connect to M2X server!\n"); +#endif + return E_NOCONNECTION; + } + int status = readStatusCode(false); + if (status == 200) { + readLocation(callback, context); + } + + close(); + return status; +} + +// Encodes and prints string using Percent-encoding specified +// in RFC 1738, Section 2.2 +static int print_encoded_string(Print* print, const char* str) { + int bytes = 0; + for (int i = 0; str[i] != 0; i++) { + if (((str[i] >= 'A') && (str[i] <= 'Z')) || + ((str[i] >= 'a') && (str[i] <= 'z')) || + ((str[i] >= '0') && (str[i] <= '9')) || + (str[i] == '-') || (str[i] == '_') || + (str[i] == '.') || (str[i] == '~')) { + bytes += print->print(str[i]); + } else { + // Encode all other characters + bytes += print->print('%'); + bytes += print->print(HEX(str[i] / 16)); + bytes += print->print(HEX(str[i] % 16)); + } + } + return bytes; +} + +static int write_location_data(Print* print, const char* name, + double latitude, double longitude, + double elevation) { + int bytes = 0; + bytes += print->print("name="); + bytes += print_encoded_string(print, name); + bytes += print->print("&latitude="); + bytes += print->print(latitude, MAX_DOUBLE_DIGITS); + bytes += print->print("&longitude="); + bytes += print->print(longitude, MAX_DOUBLE_DIGITS); + bytes += print->print("&elevation="); + bytes += print->print(elevation); + return bytes; +} + +static int write_location_data(Print* print, const char* name, + const char* latitude, const char* longitude, + const char* elevation) { + int bytes = 0; + bytes += print->print("name="); + bytes += print_encoded_string(print, name); + bytes += print->print("&latitude="); + bytes += print_encoded_string(print, latitude); + bytes += print->print("&longitude="); + bytes += print_encoded_string(print, longitude); + bytes += print->print("&elevation="); + bytes += print_encoded_string(print, elevation); + return bytes; +} + +int M2XStreamClient::updateLocation(const char* feedId, + const char* name, + double latitude, + double longitude, + double elevation) { + if (_client->connect(_host, _port)) { +#ifdef DEBUG + printf("Connected to M2X server!\n"); +#endif + + int length = write_location_data(&_null_print, name, latitude, longitude, + elevation); + _client->print("PUT /v1/feeds/"); + print_encoded_string(_client, feedId); + _client->println("/location HTTP/1.0"); + + writeHttpHeader(length); + write_location_data(_client, name, latitude, longitude, elevation); + } else { +#ifdef DEBUG + printf("ERROR: Cannot connect to M2X server!\n"); +#endif + return E_NOCONNECTION; + } + return readStatusCode(true); +} + +int M2XStreamClient::updateLocation(const char* feedId, + const char* name, + const char* latitude, + const char* longitude, + const char* elevation) { + if (_client->connect(_host, _port)) { +#ifdef DEBUG + printf("Connected to M2X server!\n"); +#endif + + int length = write_location_data(&_null_print, name, latitude, longitude, + elevation); + _client->print("PUT /v1/feeds/"); + print_encoded_string(_client, feedId); + _client->println("/location HTTP/1.0"); + + writeHttpHeader(length); + write_location_data(_client, name, latitude, longitude, elevation); + } else { +#ifdef DEBUG + printf("ERROR: Cannot connect to M2X server!\n"); +#endif + return E_NOCONNECTION; + } + return readStatusCode(true); +} + +void M2XStreamClient::writeSendHeader(const char* feedId, + const char* streamName, + int contentLength) { + _client->print("PUT /v1/feeds/"); + print_encoded_string(_client, feedId); + _client->print("/streams/"); + print_encoded_string(_client, streamName); + _client->println(" HTTP/1.0"); + + writeHttpHeader(contentLength); +} + +void M2XStreamClient::writeHttpHeader(int contentLength) { + _client->println(kUserAgentLine); + _client->print("X-M2X-KEY: "); + _client->println(_key); + + _client->print("Host: "); + print_encoded_string(_client, _host); + if (_port != kDefaultM2XPort) { + _client->print(":"); + // port is an integer, does not need encoding + _client->print(_port); + } + _client->println(); + + if (contentLength > 0) { + _client->println("Content-Type: application/x-www-form-urlencoded"); +#ifdef DEBUG + printf("Content Length: %d\n", contentLength); +#endif + _client->print("Content-Length: "); + _client->println(contentLength); + } + _client->println(); +} + +int M2XStreamClient::waitForString(const char* str) { + int currentIndex = 0; + if (str[currentIndex] == '\0') return E_OK; + + while (true) { + while (_client->available()) { + char c = _client->read(); +#ifdef DEBUG + printf("%c", c); +#endif + + if ((str[currentIndex] == '*') || + (c == str[currentIndex])) { + currentIndex++; + if (str[currentIndex] == '\0') { + return E_OK; + } + } else { + // start from the beginning + currentIndex = 0; + } + } + + if (!_client->connected()) { +#ifdef DEBUG + printf("ERROR: The client is disconnected from the server!\n"); +#endif + close(); + return E_DISCONNECTED; + } + + delay(1000); + } + // never reached here + return E_NOTREACHABLE; +} + +int M2XStreamClient::readStatusCode(bool closeClient) { + int responseCode = 0; + int ret = waitForString("HTTP/*.* "); + if (ret != E_OK) { + if (closeClient) close(); + return ret; + } + + // ret is not needed from here(since it must be E_OK), so we can use it + // as a regular variable now. + ret = 0; + while (true) { + while (_client->available()) { + char c = _client->read(); +#ifdef DEBUG + printf("%c", c); +#endif + responseCode = responseCode * 10 + (c - '0'); + ret++; + if (ret == 3) { + if (closeClient) close(); + return responseCode; + } + } + + if (!_client->connected()) { +#ifdef DEBUG + printf("ERROR: The client is disconnected from the server!\n"); +#endif + if (closeClient) close(); + return E_DISCONNECTED; + } + + delay(1000); + } + + // never reached here + return E_NOTREACHABLE; +} + +int M2XStreamClient::readContentLength() { + int ret = waitForString("Content-Length: "); + if (ret != E_OK) { + return ret; + } + + // From now on, ret is not needed, we can use it + // to keep the final result + ret = 0; + while (true) { + while (_client->available()) { + char c = _client->read(); +#ifdef DEBUG + printf("%c", c); +#endif + if ((c == '\r') || (c == '\n')) { + return (ret == 0) ? (E_INVALID) : (ret); + } else { + ret = ret * 10 + (c - '0'); + } + } + + if (!_client->connected()) { +#ifdef DEBUG + printf("ERROR: The client is disconnected from the server!\n"); +#endif + return E_DISCONNECTED; + } + + delay(1000); + } + + // never reached here + return E_NOTREACHABLE; +} + +int M2XStreamClient::skipHttpHeader() { + return waitForString("\r\n\r\n"); +} + +void M2XStreamClient::close() { + // Eats up buffered data before closing + _client->flush(); + _client->stop(); +} + +int M2XStreamClient::readStreamValue(stream_value_read_callback callback, + void* context) { + const int BUF_LEN = 32; + char buf[BUF_LEN]; + + int length = readContentLength(); + if (length < 0) { + close(); + return length; + } + + int index = skipHttpHeader(); + if (index != E_OK) { + close(); + return index; + } + index = 0; + + stream_parsing_context_state state; + state.state = state.index = 0; + state.callback = callback; + state.context = context; + + jsonlite_parser_callbacks cbs = jsonlite_default_callbacks; + cbs.key_found = on_stream_key_found; + cbs.string_found = on_stream_string_found; + cbs.context.client_state = &state; + + jsonlite_parser p = jsonlite_parser_init(jsonlite_parser_estimate_size(5)); + jsonlite_parser_set_callback(p, &cbs); + + jsonlite_result result = jsonlite_result_unknown; + while (index < length) { + int i = 0; + +#ifdef DEBUG + printf("Received Data: "); +#endif + while ((i < BUF_LEN) && _client->available()) { + buf[i++] = _client->read(); +#ifdef DEBUG + printf("%c", buf[i - 1]); +#endif + } +#ifdef DEBUG + printf("\n"); +#endif + + if ((!_client->connected()) && + (!_client->available()) && + ((index + i) < length)) { + jsonlite_parser_release(p); + close(); + return E_NOCONNECTION; + } + + result = jsonlite_parser_tokenize(p, buf, i); + if ((result != jsonlite_result_ok) && + (result != jsonlite_result_end_of_stream)) { + jsonlite_parser_release(p); + close(); + return E_JSON_INVALID; + } + + index += i; + } + + jsonlite_parser_release(p); + close(); + return (result == jsonlite_result_ok) ? (E_OK) : (E_JSON_INVALID); +} + +int M2XStreamClient::readLocation(location_read_callback callback, + void* context) { + const int BUF_LEN = 40; + char buf[BUF_LEN]; + + int length = readContentLength(); + if (length < 0) { + close(); + return length; + } + + int index = skipHttpHeader(); + if (index != E_OK) { + close(); + return index; + } + index = 0; + + location_parsing_context_state state; + state.state = state.index = 0; + state.callback = callback; + state.context = context; + + jsonlite_parser_callbacks cbs = jsonlite_default_callbacks; + cbs.key_found = on_location_key_found; + cbs.string_found = on_location_string_found; + cbs.context.client_state = &state; + + jsonlite_parser p = jsonlite_parser_init(jsonlite_parser_estimate_size(5)); + jsonlite_parser_set_callback(p, &cbs); + + jsonlite_result result = jsonlite_result_unknown; + while (index < length) { + int i = 0; + +#ifdef DEBUG + printf("Received Data: "); +#endif + while ((i < BUF_LEN) && _client->available()) { + buf[i++] = _client->read(); +#ifdef DEBUG + printf("%c", buf[i - 1]); +#endif + } +#ifdef DEBUG + printf("\n"); +#endif + + if ((!_client->connected()) && + (!_client->available()) && + ((index + i) < length)) { + jsonlite_parser_release(p); + close(); + return E_NOCONNECTION; + } + + result = jsonlite_parser_tokenize(p, buf, i); + if ((result != jsonlite_result_ok) && + (result != jsonlite_result_end_of_stream)) { + jsonlite_parser_release(p); + close(); + return E_JSON_INVALID; + } + + index += i; + } + + jsonlite_parser_release(p); + close(); + return (result == jsonlite_result_ok) ? (E_OK) : (E_JSON_INVALID); +} + +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/M2XStreamClient.h Thu Oct 24 12:22:33 2013 +0000 @@ -0,0 +1,128 @@ +#ifndef M2XStreamClient_h +#define M2XStreamClient_h + +#define MIN(a, b) (((a) > (b))?(b):(a)) + +#include "mbed.h" +#include "Client.h" +#include "Utility.h" + +#include "NullPrint.h" + +static const int E_OK = 0; +static const int E_NOCONNECTION = -1; +static const int E_DISCONNECTED = -2; +static const int E_NOTREACHABLE = -3; +static const int E_INVALID = -4; +static const int E_JSON_INVALID = -5; + +typedef void (*stream_value_read_callback)(const char* at, + const char* value, + int index, + void* context); + +typedef void (*location_read_callback)(const char* name, + double latitude, + double longitude, + double elevation, + const char* timestamp, + int index, + void* context); + +class M2XStreamClient { +public: + static const char* kDefaultM2XHost; + static const int kDefaultM2XPort = 80; + + M2XStreamClient(Client* client, + const char* key, + const char* host = kDefaultM2XHost, + int port = kDefaultM2XPort); + + // Update data stream, returns the HTTP status code + int send(const char* feedId, const char* streamName, double value); + int send(const char* feedId, const char* streamName, long value); + int send(const char* feedId, const char* streamName, int value); + int send(const char* feedId, const char* streamName, const char* value); + + // Receive values for a particular data stream. Since memory is + // very limited on an Arduino, we cannot parse and get all the + // data points in memory. Instead, we use callbacks here: whenever + // a new data point is parsed, we call the callback using the values, + // after that, the values will be thrown away to make space for new + // values. + // Note that you can also pass in a user-specified context in this + // function, this context will be passed to the callback function + // each time we get a data point. + // For each data point, the callback will be called once. The HTTP + // status code will be returned. And the content is only parsed when + // the status code is 200. + int receive(const char* feedId, const char* streamName, + stream_value_read_callback callback, void* context); + + // Update datasource location + // NOTE: On an Arduino Uno and other ATMEGA based boards, double has + // 4-byte (32 bits) precision, which is the same as float. So there's + // no natural double-precision floating number on these boards. With + // a float value, we have a precision of roughly 7 digits, that means + // either 5 or 6 digits after the floating point. According to wikipedia, + // a difference of 0.00001 will give us ~1.1132m distance. If this + // precision is good for you, you can use the double-version we provided + // here. Otherwise, you may need to use the string-version and do the + // actual conversion by yourselves. + // However, with an Arduino Due board, double has 8-bytes (64 bits) + // precision, which means you are free to use the double-version only + // without any precision problems. + // Returned value is the http status code. + int updateLocation(const char* feedId, const char* name, + double latitude, double longitude, double elevation); + int updateLocation(const char* feedId, const char* name, + const char* latitude, const char* longitude, + const char* elevation); + + // Read location information for a feed. Also used callback to process + // data points for memory reasons. The HTTP status code is returned, + // response is only parsed when the HTTP status code is 200 + int readLocation(const char* feedId, location_read_callback callback, + void* context); +private: + Client* _client; + const char* _key; + const char* _host; + int _port; + NullPrint _null_print; + + // Writes the HTTP header part for updating a stream value + void writeSendHeader(const char* feedId, + const char* streamName, + int contentLength); + // Writes HTTP header lines including M2X key, host, content + // type and content length(if the body exists) + void writeHttpHeader(int contentLength); + // Parses HTTP response header and return the content length. + // Note that this function does not parse all http headers, as long + // as the content length is found, this function will return + int readContentLength(); + // Skips all HTTP response header part. Return minus value in case + // the connection is closed before we got all headers + int skipHttpHeader(); + // Parses and returns the HTTP status code, note this function will + // return immediately once it gets the status code + int readStatusCode(bool closeClient); + // Waits for a certain string pattern in the HTTP header, and returns + // once the pattern is found. In the pattern, you can use '*' to denote + // any character + int waitForString(const char* str); + // Closes the connection + void close(); + // Parses JSON response of stream value API, and calls callback function + // once we get a data point + int readStreamValue(stream_value_read_callback callback, void* context); + // Parses JSON response of location API, and calls callback function once + // we get a data point + int readLocation(location_read_callback callback, void* context); +}; + +#endif /* M2XStreamClient_h */ + +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/NullPrint.h Thu Oct 24 12:22:33 2013 +0000 @@ -0,0 +1,19 @@ +#ifndef NullPrint_h +#define NullPrint_h + +#include "Print.h" + +// Null Print class used to calculate length to print +class NullPrint : public Print { +public: + virtual size_t write(uint8_t b) { + return 1; + } + + virtual size_t write(const uint8_t* buf, size_t size) { + return size; + } +}; + +#endif /* NullPrint_h */ +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Print.cpp Thu Oct 24 12:22:33 2013 +0000 @@ -0,0 +1,63 @@ +#include "Print.h" +#include "mbed.h" + +#include <stdio.h> +#include <string.h> + +size_t Print::write(const uint8_t* buf, size_t size) { + size_t ret = 0; + while (size--) { + ret += write(*buf++); + } + return ret; +} + +size_t Print::print(const char* s) { + return write((const uint8_t*)s, strlen(s)); +} + +size_t Print::print(char c) { + return write(c); +} + +size_t Print::print(int n) { + return print((long) n); +} + +size_t Print::print(long n) { + char buf[8 * sizeof(long) + 1]; + snprintf(buf, sizeof(buf), "%ld", n); + return print(buf); +} + +// Digits are ignored for now +size_t Print::print(double n, int digits) { + char buf[65]; + snprintf(buf, sizeof(buf), "%g", n); + return print(buf); +} + +size_t Print::println(const char* s) { + return print(s) + println(); +} + +size_t Print::println(char c) { + return print(c) + println(); +} + +size_t Print::println(int n) { + return print(n) + println(); +} + +size_t Print::println(long n) { + return print(n) + println(); +} + +size_t Print::println(double n, int digits) { + return print(n, digits) + println(); +} + +size_t Print::println() { + return print('\r') + print('\n'); +} +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Print.h Thu Oct 24 12:22:33 2013 +0000 @@ -0,0 +1,27 @@ +#ifndef Print_h +#define Print_h + +#include <stddef.h> +#include <stdint.h> + +class Print { +public: + size_t print(const char* s); + size_t print(char c); + size_t print(int n); + size_t print(long n); + size_t print(double n, int digits = 2); + + size_t println(const char* s); + size_t println(char c); + size_t println(int n); + size_t println(long n); + size_t println(double n, int digits = 2); + size_t println(); + + virtual size_t write(uint8_t c) = 0; + virtual size_t write(const uint8_t* buf, size_t size); +}; + +#endif +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/StreamParseFunctions.h Thu Oct 24 12:22:33 2013 +0000 @@ -0,0 +1,70 @@ +#ifndef StreamParseFunctions_h +#define StreamParseFunctions_h + +// Data structures and functions used to parse stream values + +#define STREAM_BUF_LEN 20 + +typedef struct { + uint8_t state; + char at_str[STREAM_BUF_LEN + 1]; + char value_str[STREAM_BUF_LEN + 1]; + int index; + + stream_value_read_callback callback; + void* context; +} stream_parsing_context_state; + +#define WAITING_AT 0x1 +#define GOT_AT 0x2 +#define WAITING_VALUE 0x4 +#define GOT_VALUE 0x8 + +#define GOT_STREAM (GOT_AT | GOT_VALUE) +#define TEST_GOT_STREAM(state_) (((state_) & GOT_STREAM) == GOT_STREAM) + +#define TEST_IS_AT(state_) (((state_) & (WAITING_AT | GOT_AT)) == WAITING_AT) +#define TEST_IS_VALUE(state_) (((state_) & (WAITING_VALUE | GOT_VALUE)) == \ + WAITING_VALUE) + +static void on_stream_key_found(jsonlite_callback_context* context, + jsonlite_token* token) +{ + stream_parsing_context_state* state = + (stream_parsing_context_state*) context->client_state; + if (strncmp((const char*) token->start, "at", 2) == 0) { + state->state |= WAITING_AT; + } else if ((strncmp((const char*) token->start, "value", 5) == 0) && + (token->start[5] != 's')) { // get rid of "values" + state->state |= WAITING_VALUE; + } +} + +static void on_stream_string_found(jsonlite_callback_context* context, + jsonlite_token* token) +{ + stream_parsing_context_state* state = + (stream_parsing_context_state*) context->client_state; + + if (TEST_IS_AT(state->state)) { + strncpy(state->at_str, (const char*) token->start, + MIN(token->end - token->start, STREAM_BUF_LEN)); + state->at_str[MIN(token->end - token->start, STREAM_BUF_LEN)] = '\0'; + state->state |= GOT_AT; + } else if (TEST_IS_VALUE(state->state)) { + strncpy(state->value_str, (const char*) token->start, + MIN(token->end - token->start, STREAM_BUF_LEN)); + state->value_str[MIN(token->end - token->start, STREAM_BUF_LEN)] = '\0'; + state->state |= GOT_VALUE; + } + + if (TEST_GOT_STREAM(state->state)) { + state->callback(state->at_str, state->value_str, + state->index++, state->context); + state->state = 0; + } +} + +#endif /* StreamParseFunctions_h */ + +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Utility.cpp Thu Oct 24 12:22:33 2013 +0000 @@ -0,0 +1,12 @@ +#include "Utility.h" + +void delay(int ms) { + wait_ms(ms); +} + +char* strdup(const char* s) { + char* ret = (char*) malloc(strlen(s) + 1); + if (ret == NULL) { return ret;} + return strcpy(ret, s); +} +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Utility.h Thu Oct 24 12:22:33 2013 +0000 @@ -0,0 +1,18 @@ +#ifndef UTILITY_H_ +#define UTILITY_H_ + +#include "mbed.h" +#include <string.h> + +#ifdef __cplusplus +extern "C" { +#endif + +void delay(int ms); +char* strdup(const char* s); + +#ifdef __cplusplus +} +#endif + +#endif