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JSON decoder
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temtronic



Joined: 01 Jul 2010
Posts: 9081
Location: Greensville,Ontario

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PostPosted: Sun Nov 20, 2022 2:53 pm     Reply with quote

You do understand that CCS default for an integer is UNSIGNED and NOT signed ?

I don't know what the JSON code needs, but if it does need a signed int, you will have to recode to make it so.
kmp84



Joined: 02 Feb 2010
Posts: 345

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PostPosted: Sun Nov 20, 2022 8:23 pm     Reply with quote

I understand you, but it’s Not the problem. Even if the type is wrong the code will compile. I have checked and edit this at the beginning.
dyeatman



Joined: 06 Sep 2003
Posts: 1910
Location: Norman, OK

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PostPosted: Sun Nov 20, 2022 8:41 pm     Reply with quote

If you are getting errors it is NOT compiling.

If the code does compile without errors what is it
doing (or not doing) vs what you expect?
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Ttelmah



Joined: 11 Mar 2010
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PostPosted: Mon Nov 21, 2022 3:20 am     Reply with quote

Looking at the code, it is using push and pop functions on a stack.
The PIC16, does not have a software accessible stack. Result not possible.
You could write your own software stack emulation functions, but easier
honestly to not use a stack based approach to do it on this chip.
temtronic



Joined: 01 Jul 2010
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PostPosted: Mon Nov 21, 2022 6:50 am     Reply with quote

I went back to the original TBxxxx.PDF. Seems it was written for an AVR not a PIC, under the Microchip compiler and not CCS C.
There is NO way the code,as presented WILL compile for a PIC without a LOT of rewriting/ translation.
kmp84



Joined: 02 Feb 2010
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PostPosted: Tue Nov 22, 2022 2:47 pm     Reply with quote

Hi All,

I have write my simple "JSON" decoder and workaround this unnecessary example.

Best Regards,
temtronic



Joined: 01 Jul 2010
Posts: 9081
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PostPosted: Tue Nov 22, 2022 3:49 pm     Reply with quote

you should post your program in the code library here for others to see.
kmp84



Joined: 02 Feb 2010
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PostPosted: Tue Nov 22, 2022 6:52 pm     Reply with quote

Hi,

I'm not sure it's for code library because I'm using just "string" library and incremental char pointer to search parts of string, but I'll post here:


Code:

#include <16F1459.h>
#device ANSI
#device PASS_STRINGS=IN_RAM
#fuses INTRC_IO,NOPLLEN,NOPROTECT,MCLR,PUT,NOWDT  // CLKOUT -> Enable clk/4 out on PIN_A4
#use delay(int=16MHz, clock=24MHz)
#use RS232(DEBUGGER,rcv=PIN_B6,xmit=PIN_B6,stream=STREAM_SERIAL_INPUT)

#define TEST_STRING "{\"yellow\":\"off\",\"red\":\"on\",\"blue\":\"off\",\"green\":\"on\"}"
#define SRC_STRING "\"red\":"

#define RED_LED_ON() output_high(PIN_C5)
#define RED_LED_OFF() output_low(PIN_C5)

#include <string.h>

int1 func(char *buff, char *src){

   int1 FL = FALSE;
   char *cPtr;
   int8 n;
   
   
   cPtr = strstr (buff, src);
   n = strlen(src);
   
   if(cPtr != NULL){
      if(memcmp(cPtr+n, "\"on\"", 4) == 0)
        FL = TRUE;
   }
   
   return FL;
}

void main(void){
   
   delay_ms(100);
   
   delay_ms(100);                //StartUp Delay.
   setup_adc(ADC_OFF);           //Stop ADC.
   setup_adc_ports(NO_ANALOGS);  //Disable Adc-channels.
   setup_comparator(NC_NC_NC_NC);//Disable Comparator module.   
   
   printf("\r\nStr1: %s,\r\nStr2: %s", TEST_STRING, SRC_STRING);
   
   if(func(TEST_STRING, SRC_STRING))
      RED_LED_ON();
   else
      RED_LED_OFF();
     
   while(TRUE){
      // user code...
   }
}


Best Regards,
densimitre



Joined: 21 Dec 2004
Posts: 45

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PostPosted: Mon Nov 28, 2022 4:53 pm     Reply with quote

kmp84 wrote:
Hi,

I'm not sure it's for code library because I'm using just "string" library and incremental char pointer to search parts of string, but I'll post here:


Code:

#include <16F1459.h>
#device ANSI
#device PASS_STRINGS=IN_RAM
#fuses INTRC_IO,NOPLLEN,NOPROTECT,MCLR,PUT,NOWDT  // CLKOUT -> Enable clk/4 out on PIN_A4
#use delay(int=16MHz, clock=24MHz)
#use RS232(DEBUGGER,rcv=PIN_B6,xmit=PIN_B6,stream=STREAM_SERIAL_INPUT)

#define TEST_STRING "{\"yellow\":\"off\",\"red\":\"on\",\"blue\":\"off\",\"green\":\"on\"}"
#define SRC_STRING "\"red\":"

#define RED_LED_ON() output_high(PIN_C5)
#define RED_LED_OFF() output_low(PIN_C5)

#include <string.h>

int1 func(char *buff, char *src){

   int1 FL = FALSE;
   char *cPtr;
   int8 n;
   
   
   cPtr = strstr (buff, src);
   n = strlen(src);
   
   if(cPtr != NULL){
      if(memcmp(cPtr+n, "\"on\"", 4) == 0)
        FL = TRUE;
   }
   
   return FL;
}

void main(void){
   
   delay_ms(100);
   
   delay_ms(100);                //StartUp Delay.
   setup_adc(ADC_OFF);           //Stop ADC.
   setup_adc_ports(NO_ANALOGS);  //Disable Adc-channels.
   setup_comparator(NC_NC_NC_NC);//Disable Comparator module.   
   
   printf("\r\nStr1: %s,\r\nStr2: %s", TEST_STRING, SRC_STRING);
   
   if(func(TEST_STRING, SRC_STRING))
      RED_LED_ON();
   else
      RED_LED_OFF();
     
   while(TRUE){
      // user code...
   }
}


Best Regards,




Here you have a simple mqtt/json parser code (part of it) with printf() outputs for debugging purposes:

JSON MQTT data is coming from SIM7600 board. You can use ex_sisr.c in order to implement ring_buffer with enough size.

Data from YAT 2.1 terminal (for debug)

Code:

+CMQTTRXSTART: 0,15,52<CR><LF> (24)
+CMQTTRXTOPIC: 0,15<CR><LF> (21)
8680200310XXXXX<CR><LF> (17)
+CMQTTRXPAYLOAD: 0,52<CR><LF> (23)
{"action":"post", "resource":"relay_0","state":"on"}<CR><LF> (54)
+CMQTTRXEND: 0<CR><LF> (16)
<CR><LF> (2)


I hope this be useful


in rx_buffer you can store data from rda_isr for post processing, using strstr to find key string position and strtok to get the data.

With a hard and dedicated work, you can make it real...

for incomming messages, poll the rx_buffer

Code:


uint8_t  mqtt_loop() {
     
      byte ret_val = AT_RESP_ERR_DIF_RESP; //default value (not open)
     
     
      /*              # Chars
      +CMQTTRXSTART:    14
      +CMQTTRXTOPIC:    14
      <           >     XX    // Topic name
      +CMQTTRXPAYLOAD:  16
      <           >     XX    // Payload data
      +CMQTTRXEND:      12
               Total    56
      */
     
      fprintf(pc,"MQTT Loop: srtlen(rx_buffer): %lu \r\n", strlen(rx_buffer));
   
       if(  (strlen(rx_buffer)>56) && isStringReceived("START:") && isStringReceived("END: ") ) {  // Valid MQTT received packet
       
       fprintf(pc,"There are JSON/MQTT data\r\n");
     
      ret_val=TRUE;
     
      }
   
   
     
      return(ret_val);
   
   }



You can make a customized function for testing any string in the rx_buffer with strstr()

isStringReceived() is strstr() based on, like arduino SIMCOM modules code



Code:

uint8_t get_mqtt_message() {
         fprintf(pc,"get_mqtt_message(): RX_Buffer:%s\r\n",rx_buffer);


         p_aux = strstr( rx_buffer,"START:");      // get starting pos of mqtt msj


         //strtok(rx_buffer,"\r\n");         // discard first LINE
         strtok(p_aux,"\r\n");               // discard first LINE
         //strtok(rx_buffer,"\r\n");         // discard TOPIC specs
         strtok(NULL,"\r\n");                // discard TOPIC specs
         
            //topic    =  strtok(NULL,"\r\n");       // store TOPIC name
            strcpy(topic,strtok(NULL,"\r\n"));
            fprintf(pc,"TOPIC NAME:%s\r\n",topic);
         
         //p_aux =  strtok(NULL,"\r\n");             // discard PAYLOAD specs
         strtok(NULL,"\r\n");             // discard PAYLOAD specs
         
            //rx_payload  =  strtok(NULL,"\r\n");       // store PAYLOAD DATA.
            strcpy(rx_json_payload,strtok(NULL,"\r\n"));
            fprintf(pc,"JSON PAYLOAD:%s\r\n",rx_json_payload);
         
         buffer_flush();   //clear rx_buffer
}




uint8_t process_mqtt_message(void)   {

   // Topic is device ID
   // Actions and Status instrucctions are included inside JSON Payload
   // Each actions/status commands have responses from device
   
   
   if(strcmp(topic,IMEI)==0)  {
   
         fprintf(pc,"MQTT MESSAGE PROCESSING.....\r\n");
   
         /* JSON MQTT Message
         {"action":"post",
         "resource":"relay_x",   //X=0,1,2,3:
         "state":"on"}
         */
         
         // Parse rx_payload data
         
         char action[10];
         char resource[10];
         char state[4];
         
         char *action_p   =  strstr(rx_json_payload,"\"action\"");
         char *resource_p =  strstr(rx_json_payload,"\"resource\"");
         char *state_p    =  strstr(rx_json_payload,"\"state\"");
         
         //Action
         strtok(action_p,":");                           // discard first LINE
         strcpy(action,strtok(NULL,","));               // get action name "get" or "post"
         fprintf(pc,"MQTT MESSAGE: \"Action\": %s\r\n", action);
         
         //Resource
         strtok(resource_p,":");                         // discard first LINE
         strcpy(resource,strtok(NULL,","));              // get action name "get" or "post"
         fprintf(pc,"MQTT MESSAGE: \"Resource\": %s\r\n", resource);
         
         //State
         strtok(state_p,":");                             // discard first LINE
         strcpy(state,strtok(NULL,"}"));                 // get action name "get" or "post"
         
         fprintf(pc,"MQTT MESSAGE: \"State\": %s\r\n", state);
         
         //fprintf(pc,"STRCMP: ACTION vs POST: %u\r\n", strcmp(action,"\"post\""));
         
         if( strcmp(action,"\"post\"")==0)   {
         
            if (strcmp(state,"\"on\"")==0) {
                             
               if(strcmp(resource,"\"relay_0\"")==0)  {
                  sprintf(tx_json_payload,"{\"report\":\"state\",\"relay_0\":\"on\"}");
                  output_high(relay_0);
                  mqtt_publish(IMEI, tx_json_payload, 0, 60, 0);   // send a feedback about the control action status to the remote controller (MQTT client or any other control platform)
                  memset(tx_json_payload, '\0', 128);
                  buffer_flush();
                }
                             
             } 
             
             if (strcmp(state,"\"off\"")==0) {
                             
               if(strcmp(resource,"\"relay_0\"")==0)  {
                  sprintf(tx_json_payload,"{\"report\":\"state\",\"relay_0\":\"off\"}");
                  output_low(relay_0);
                  mqtt_publish(IMEI, tx_json_payload, 0, 60, 0); // send a feedback about the control action status to the remote controller (MQTT client or any other control platform)
                  memset(tx_json_payload, '\0', 128);
                  buffer_flush();
                }
               
             
               
        }  //if (strcmp(state,"\"on\"")
         
     
      }  //if( strcmp(action,"\"post\"")==0)
   }  // if (IMEI)
}  //process_mqtt_message(void)




KR
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