Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed
HTTPClient.h
00001 #ifndef HTTPCLIENT_H 00002 #define HTTPCLIENT_H 00003 00004 #include "TCPConnection.h" 00005 #include "NetServer.h" 00006 #include "iputil.h" 00007 00008 /* Class: HTTPClient 00009 * A simple Class to fetch HTTP Pages. 00010 */ 00011 class HTTPClient : public TCPConnection { 00012 public: 00013 /* Constructor: HTTPClient 00014 * Creates an HTTPClient object. You might want to initialise the network server befor. 00015 * If you dont do it it will be happen by the first post or get request you make. 00016 * 00017 * To initialize the network server on creation of the HTTPClient object it's possible to parse some arguments. 00018 * 00019 * Variables: 00020 * hostname - A host name for the device. Might take a while to appear in the network, 00021 * depends on the network infrastructure. Furthermore in most cases you have 00022 * to add your domainname after the host name to address the device. 00023 * Default is NULL. 00024 * ip - The device ipaddress or ip_addr_any for dhcp. Default is ip_addr_any 00025 * nm - The device netmask or ip_addr_any for dhcp. Default is ip_addr_any. 00026 * gw - The device gateway or ip_addr_any for dhcp. Default is ip_addr_any. 00027 * dns - The device first dns server ip or ip_addr_any for dhcp. Default is ip_addr_any. 00028 * 00029 * Example: 00030 * > HTTPClient http; // Simple DHCP, brings up the TCP/IP stack on first get/post reguest. 00031 * 00032 * > HTTPClient http("worf"); // Brings up the device with DHCP and sets the host name "worf" 00033 * > // The device will be available under worf.<your local domain> 00034 * > // for example worf.1-2-3-4.dynamic.sky.com 00035 * 00036 * > HTTPClient http("wolf", // Brings up the device with static IP address and domain name. 00037 * > IPv4(192,168,0,44), // IPv4 is a helper function which allows to rtype ipaddresses direct 00038 * > IPv4(255,255,255,0), // as numbers in C++. 00039 * > IPv4(192,168,0,1), // the device address is set to 192.168.0.44, netmask 255.255.255.0 00040 * > IPv4(192,168,0,1)); // default gateway is 192.168.0.1 and dns to 192.168.0.1 as well. 00041 * > 00042 */ 00043 HTTPClient(const char *hostname = NULL, struct ip_addr ip = ip_addr_any, struct ip_addr nm = ip_addr_any, struct ip_addr gw = ip_addr_any, struct ip_addr dns = ip_addr_any); 00044 00045 /* Destructor: ~HTTPClient 00046 * Destroys the HTTPClient class. 00047 */ 00048 virtual ~HTTPClient() { 00049 if(_auth) { 00050 delete _auth; 00051 _auth = NULL; 00052 } 00053 } 00054 00055 /* Function: headers 00056 * Add header additional Information to the next post or get requests. 00057 * Somtimes it is useful to add further header information. For example an auth field. 00058 * Each time you call this function it will be replace the header fields given by an 00059 * prior call. 00060 * 00061 * It will not free your data. 00062 * Variables: 00063 * fields - A string containing all fields you want to add. Seperated by "\\r\\n". 00064 * 00065 */ 00066 void headers(const char *fields); 00067 00068 /* Function: auth 00069 * Enables basic authentication. Just enter username and password 00070 * and they will be used for all requests. 00071 * If you want to lean your username and passwort just insert NULL, NULL. 00072 * 00073 * Variables: 00074 * user - Username for ure auth or NULL. 00075 * password - Password for auth or NULL. 00076 */ 00077 void auth(const char *user, const char *password); 00078 00079 /* Function: get 00080 * A simple get-request just insert the url. 00081 * But if you want you can get the result back as a string. 00082 * Sometimes you want get a large result, more than 64 Bytes 00083 * than define your size. 00084 * 00085 * Variables: 00086 * url - The requested URL. 00087 * result - The answere to your request, by default you have not to take it. But if you want it, it has a default length from 64 Bytes. 00088 * rsize - The maximum size of your result. By default 64 Bytes. 00089 * returns - The length of your demanted result or 1 if the request is succssesful or 0 if it failed. But it might be 0 too wether your result has 0 in length. 00090 */ 00091 unsigned int get(const char *url, char *result = NULL, int rsize = 64); 00092 00093 /* Function: get 00094 * A simple get-request just insert the url and a FILE Pointer. 00095 * This get request will save yor result to an file. Very helpful if you demat a big bunch of data. 00096 * 00097 * Variables: 00098 * url - The requested URL. 00099 * result - The FILE Pointer in which you want to store the result. 00100 * returns - The length of your demanted result or 1 if the request is succssesful or 0 if it failed. But it might be 0 too wether your result has 0 in length. 00101 */ 00102 unsigned int get(const char *url, FILE *result); 00103 00104 /* Function: post 00105 * A simple post-request just insert the url. 00106 * You can send data if you want but they should be NULL-Terminated. 00107 * If you want you can get the result back as a string. 00108 * Sometimes you want get a large result, more than 64 Bytes 00109 * than define your size. 00110 * 00111 * Variables: 00112 * url - The requested URL. 00113 * data - A char array of the data you might want to send. 00114 * result - The answere to your request, by default you have not to take it. But if you want it, it has a default length from 64 Bytes. 00115 * rsize - The maximum size of your result. By default 64 Bytes. 00116 * returns - The length of your demanted result or 1 if the request is succssesful or 0 if it failed. But it might be 0 too wether your result has 0 in length. 00117 */ 00118 unsigned int post(const char *url, const char *data = NULL, char *result = NULL, int rsize = 64); 00119 00120 /* Function: post 00121 * A simple get-request just insert the url and a FILE Pointer. 00122 * You can send data if you want but they should be NULL-Terminated. 00123 * This get request will save yor result to an file. Very helpful if you demat a big bunch of data. 00124 * 00125 * Variables: 00126 * url - The requested URL. 00127 * data - A char array of the data you might want to send. 00128 * result - The FILE Pointer in which you want to store the result. 00129 * returns - The length of your demanted result or 1 if the request is succssesful or 0 if it failed. But it might be 0 too wether your result has 0 in length. 00130 */ 00131 unsigned int post(const char *url, const char *data, FILE *result); 00132 00133 /* Function: post 00134 * A simple get-request just insert the url and a two FILE Pointers to send the content of the file out and store you results. 00135 * Your data to sent can come from a file. 00136 * This get request will save yor result to an file. Very helpful if you demat a big bunch of data. 00137 * 00138 * Variables: 00139 * url - The requested URL. 00140 * data - A FILE Pointer of a file you might want to send. 00141 * result - The FILE Pointer in which you want to store the result. 00142 * returns - The length of your demanted result or 1 if the request is succssesful or 0 if it failed. But it might be 0 too wether your result has 0 in length. 00143 */ 00144 unsigned int post(const char *url, FILE *data, FILE *result); 00145 00146 /* Function: post 00147 * A simple get-request just insert the url and a two FILE Pointers to send the content of the file out and store you results. 00148 * Your data to sent can come from a file. 00149 * If you want you can get the result back as a string. 00150 * Sometimes you want get a large result, more than 64 Bytes 00151 * than define your size. 00152 * 00153 * url - The requested URL. 00154 * data - A FILE Pointer of a file you might want to send. 00155 * result - The answere to your request, by default you have not to take it. But if you want it, it has a default length from 64 Bytes. 00156 * length - The maximum size of your result. By default 64 Bytes. 00157 * returns - The length of your demanted result or 1 if the request is succssesful or 0 if it failed. But it might be 0 too wether your result has 0 in length. 00158 */ 00159 unsigned int post(const char *url, FILE *data = NULL, char *result = NULL, int length = 64); 00160 00161 /* Function: timeout 00162 * Sets the timout for a HTTP request. 00163 * The timout is the time wich is allowed to spent between two incomming TCP packets. 00164 * If the time is passed the connection will be closed. 00165 */ 00166 void timeout(int value); 00167 00168 private: 00169 virtual void err(err_t err); 00170 virtual err_t poll(); 00171 virtual err_t sent(u16_t len) {return ERR_OK;}; 00172 virtual err_t connected(err_t err); 00173 virtual err_t recv(struct pbuf *q, err_t err); 00174 virtual void dnsreply(const char *hostname, struct ip_addr *ipaddr); 00175 unsigned int make(const char *); 00176 00177 char *_auth; 00178 bool _ready; 00179 char _mode; 00180 char _state; 00181 int _timeout; 00182 const char *_host; 00183 const char *_path; 00184 void *_result; 00185 void *_data; 00186 const char *_request; 00187 const char *_headerfields; 00188 unsigned int _hostlen; 00189 unsigned int _resultoff; 00190 unsigned int _resultleft; 00191 int _timeout_max; 00192 }; 00193 00194 #endif
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