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plen = es.ES_fill_tcp_data_p (buf, plen, PSTR ("Sensor E:")); i=0; while (temp_string_e[i]) { buf[TCP_CHECKSUM_L_P+3+plen]=temp_string_e[i++]; plen++; } plen = es.ES_fill_tcp_data_p (buf, plen, PSTR ("<br />")); // Read sensor F plen = es.ES_fill_tcp_data_p (buf, plen, PSTR ("Sensor F:")); i=0; while (temp_string_f[i]) { buf[TCP_CHECKSUM_L_P+3+plen]=temp_string_f[i++]; plen++; } plen = es.ES_fill_tcp_data_p (buf, plen, PSTR ("<br />")); At the end of the page we append two HTML forms to display navigation buttons. The first form causes a hidden input field, cmd, to be submitted with a value of 1, while the second does almost the exact same thing but submits a value of 2. // Display a form button to update the display plen = es.ES_fill_tcp_data_p (buf, plen, PSTR ("<form METHOD=get action=\"")); plen = es.ES_fill_tcp_data (buf, plen, baseurl); plen = es.ES_fill_tcp_data_p (buf, plen, PSTR ("\">")); plen = es.ES_fill_tcp_data_p (buf, plen, PSTR("<input type=hidden name=cmd value=1>")); plen = es.ES_fill_tcp_data_p (buf, plen, PSTR("<input type=submit value=\"Data\">")); plen = es.ES_fill_tcp_data_p (buf, plen, PSTR("</form>")); // Display a form button to access the "About" page plen = es.ES_fill_tcp_data_p (buf, plen, PSTR ("<form METHOD=get action=\"")); plen = es.ES_fill_tcp_data (buf, plen, baseurl); plen = es.ES_fill_tcp_data_p (buf, plen, PSTR ("\">")); plen = es.ES_fill_tcp_data_p (buf, plen, PSTR("<input type=hidden name=cmd value=2>")); plen = es.ES_fill_tcp_data_p (buf, plen, PSTR("<input type=submit value=\"About\">")); plen = es.ES_fill_tcp_data_p (buf, plen, PSTR("</form>")); return (plen); } The function to generate the About page is similarto the previous function but is much simpler. Rather than reading the temperature sensors, it simply sends back some static text followed by the navigation links. /** * Generate a web page containing the "About" text */ uint16_t print_webpage_about (uint8_t *buf) { uint16_t plen; // Length of response packet // Send HTTP content-type header plen = es.ES_fill_tcp_data_p (buf, 0, PSTR ("HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n")); // Display the text for the "About" page plen = es.ES_fill_tcp_data_p (buf, plen, PSTR ("<h1>Online Thermometer v1.0</h1>"));

Even though you tried hard not to call foreign code, you ve just done so The second and even less visible problem is.

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While it s possible to create a string by concatenation building up the pieces one at a time and using the plus sign (+) operator to join them together that becomes extremely tedious if you need to include multiple variables or generated values in the final result. So most languages, Python included, provide a simpler way to interpolate variables and values into a string using special formatting characters. The formatting characters (and, in many languages, the names of functions that build up strings in this fashion) come from the printf family of functions in the standard library of the C programming language. But Python doesn t use a function for this. Instead, you simply write out the string with the appropriate formatting characters, then follow it with a percent sign (%) and any values to be interpolated into the result. The full specification of Python s string-formatting syntax, including a list of the formatting characters, is available in the Python documentation online at http://docs.python.org/lib/typesseq-strings. html.

plen = esES_fill_tcp_data_p (buf, plen, PSTR ("As featured in Practical Arduino<br />")); plen = esES_fill_tcp_data_p (buf, plen, PSTR ("See <a href=\"http://practicalarduinocom\">practicalarduinocom</a> for more info")); // Display a form button to update the display plen = esES_fill_tcp_data_p (buf, plen, PSTR ("<form METHOD=get action=\"")); plen = esES_fill_tcp_data (buf, plen, baseurl); plen = esES_fill_tcp_data_p (buf, plen, PSTR ("\">")); plen = esES_fill_tcp_data_p (buf, plen, PSTR("<input type=hidden name=cmd value=1>")); plen = esES_fill_tcp_data_p (buf, plen, PSTR("<input type=submit value=\"Data\">")); plen = esES_fill_tcp_data_p (buf, plen, PSTR("</form>")); // Display a form button to access the "About" page plen = esES_fill_tcp_data_p (buf, plen, PSTR ("<form METHOD=get action=\"")); plen = esES_fill_tcp_data (buf, plen, baseurl); plen = esES_fill_tcp_data_p (buf, plen, PSTR ("\">")); plen = esES_fill_tcp_data_p (buf, plen, PSTR("<input type=hidden name=cmd value=2>")); plen = esES_fill_tcp_data_p (buf, plen, PSTR("<input type=submit value=\"About\">")); plen = es.

that library are unlikely to read the specification. In practice, almost nobody actually reads the specification unless they are completely stuck. Until then, they use the try and see approach. For example, they write some code, try it, and if it works they re done. But, of course, they observe the behavior of the implementation and not the specification. In this way they might end up relying on behavior that is either unspecified or contradicts the specification. Obviously, both these situations are dangerous for the smooth coexistence of future versions of the library and applications that are using it. When you release the new version of the library, with a few bug fixes and maybe also a few new features, the actual behavior shifts, as in Figure 4-3.

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