fran.ccTinyPostmanTinyPostman is a REST-like protocol for reading and writing data resources from microcontrollers via a serial port. It is based on the TinyPacks data serialization format and supports the REST methods GET, PUT, POST and DELETE.The current C++ implementation for Arduino and Atmel AVR microcontrollers usesabout 1.5 KB of Flash and 48 bytes of RAM.Frame formatThe TinyPostman requests and responses are encoded as a sequence of TinyPacksvalues as follow:Request< method:Integer >  < token:Integer >  < path:String >  [ payload:* ]Response< code:Integer >  < token:Integer >  [ payload:* ]Referencesmethod:  An integer value representing one of the following methods:1   Get2   Post3   Put4   Deletetoken:   An integer value used as ID for the request and treated asopaque value when processing the request.path:    The path of the addressed resource encoded as an UTF-8 string.code:    An integer value representing one of the following responsecodes:0x21    201 Created0x22    202 Deleted0x24    204 Changed0x25    205 Content0x40    400 Bad Request0x41    401 Unauthorized0x43    403 Forbidden0x44    404 Not Found0x45    405 Method Not Allowed0x4D    413 Request Entity Too Largepayload: An optional payload encoded as one or more TinyPacks values.Code examplesPythonfrom tinypostman import *pm = tinypostman.Postman("/dev/ttyUSB0")response = pm.get("")if response[0] == TPM_205_Content:resources = response[1]for resource in resources:print(resource + ":")response = pm.get(resource)if response[0] == TPM_205_Content:print(repr(response[1]))else:print("Cannot get the %s resource." % resource)else:print("Cannot get the resource index.")Arduino#include <TinyPostman.h>#define   MAX_PACKET_LENGTH 128 uint8_t   pack_buffer[MAX_PACKET_LENGTH];Postman   postman;Framer    framer(pack_buffer, MAX_PACKET_LENGTH);class LED : public Resource {uint8_t  led_pin;public:LED() { led_pin = 13; pinMode(led_pin, OUTPUT); };uint8_t get(Request &request) {request.writer.openMap();request.writer.putString("pin");request.writer.putInteger(led_pin);request.writer.putString("state");request.writer.putBoolean(digitalRead(led_pin));request.writer.close();return TPM_205_Content;}uint8_t put(Request &request) {request.reader.next();if(request.reader.openMap()) {while(request.reader.next()) {if     (request.reader.match("pin"))     { led_pin = request.reader.getInteger(); pinMode(led_pin, OUTPUT); }else if(request.reader.match("state"))   digitalWrite(led_pin, request.reader.getBoolean());else request.reader.next();        }request.reader.close();return TPM_204_Changed;}elsereturn TPM_400_Bad_Request;}} led_resource;void setup(){postman.registerResource("led", led_resource);Serial.begin(9600);}void loop(){if(framer.getState() == TPM_SENDING)Serial.write(framer.getByteToSend());while(framer.getState() == TPM_RECEIVING && Serial.available() > 0) {if(framer.putReceivedByte(Serial.read()) && framer.getLength()) {framer