So all started last year in class when I was talking to a friend about the nspire after some time we discussed that I will be cool to be able to send SMS with the nspire. After that I did some research on how I will be able to do this:
First solution was LUA but the send function was not implemented in my calc version and there is no way to get data back.
Next was Ndless which one I choose. After letting the project die for almost 6 months I restarted it and started making my program on the calc side.
I have take about a 3-4 month to send and get data "flawlessly". But after a LOT of tweaking. I can send and receive msg via the uart port at the bottom of the calc. Next I have implemented contact selection. For all of my testing I have to solder a wire to the back port on the calc and fault "Humm that such a terrible idea". So I went in solidworks and started designing my own case for the ti and here is my first test:

Very old link: (http://i65.tinypic.com/k4fp80.jpg)
I haven't 3D printed the final version yet so I can't show you.

After the ndless part completed I let the project die again for around a month and then I started modifying the case a little bit more to add pin hole / hole for the Bluetooth module /etc...
Then I started making the android app to make the SMS sending / reading possible add I did that for around two month on Android studio.

And here I am with my first working prototype of the Nspire SMS Shield "working":

Old links see new shield below
( http://i66.tinypic.com/skvsc4.jpg / http://i66.tinypic.com/kthz5.jpg )

There is a lot of tweaking left to do but I works and I'm not stopping the developement here
If you are interested in the source code please contact me

UPDATE n°1:

It's a long time i know. So i have make a github if someone got any interest: https://github.com/TurtleForGaming/nspire-communication
I've make a new 3d printed shield (last version I think):


And I completly redone the apps
(Video comming soon)

So for around 2month now I'm developping an bluetooth interface (via UART) to the TI-Nspire. For that I use ndless and nspire-io (a bit modified to not lock the calc while waiting for message and echo remove). But for the past day I'm encoutering a little problem:  when i send a message to the calc (with or without bluetooth) I only get 32chars for exemple if I send:

Quote%%|NUMS|10|TestA|TestB|TestC|TestD|TestE|TestF|TestG|TestH|TestI|TestJ

I will only get

Quote%%|NUMS|10|TestA|TestB|TestC|Tes

which is a big problem for me and I don't really know why it append.

Here is my code:
#include <os.h>
#include <nspireio/uart.hpp>
#include <nspireio/console.hpp>

int key_already_pressed_ctrl = 0;
int key_already_pressed_contact = 0;
char* contact = "%%|NUMS|6|Name1|Name2|Name3|Name4|Name6|Name7";
int hasSelectedContact = 0;

// Modidification of the uart_getsn() function to remove the echo.


char* uart_getsn_mdf(char* str, int num) {
for(int i = 0; i < num-1; i++){
if(uart_ready()) {
char c = uart_getchar();
str[i] = c;
if(c == '\b'){ i -= 2; }
else if(c == '\r') { str[i] =0; return str; }
}
}
str[num] = 0;
return str;
}

char* uart_gets_mdf(char* str)
{
        return uart_getsn_mdf(str,50);
}

int numberOfCharsInArray(char* array) {
  return strlen(array);
}

int main(void)
{
//Write the program title
assert_ndless_rev(874);
nio_console csl;
nio_init(&csl,NIO_MAX_COLS,NIO_MAX_ROWS,0,0,NIO_COLOR_WHITE,NIO_COLOR_BLACK,TRUE);
nio_set_default(&csl);
nio_color(&csl,NIO_COLOR_BLACK,NIO_COLOR_WHITE);
nio_printf("               Nspire UART Chat by Samy.             ");
nio_printf("         Compiled the %s At %s        ",__DATE__,__TIME__);
nio_color(&csl,NIO_COLOR_BLACK,NIO_COLOR_LIGHTRED);
nio_printf("      Press  ESC key to exit and CTRL to send msg.    ");
nio_printf("                                                    ");
nio_color(&csl,NIO_COLOR_WHITE,NIO_COLOR_BLACK);
nio_puts("");

//Send that we are online
uart_printf("#$#CALC:ENTERING:SMS\r\n");

//Main loop
while(!isKeyPressed(KEY_NSPIRE_ESC)){
if(isKeyPressed(KEY_NSPIRE_CTRL) && !key_already_pressed_ctrl && !key_already_pressed_contact){
if(hasSelectedContact) {
nio_printf("<< ");
char output[90] = {0};
nio_getsn(output,90);
uart_printf("$#$SMS:");
int num = numberOfCharsInArray(output);
for(char* it = output; *it; ++it) {
uart_printf("%c",*it);
sleep(100);
}
uart_printf("\r\n");
} else {
nio_printf("You must select an contact !\r\n");
}
key_already_pressed_ctrl = 1;
}
if(isKeyPressed(KEY_NSPIRE_C) && !key_already_pressed_contact && !key_already_pressed_ctrl){
// START Contact select part
nio_clear(&csl);
//Title
nio_color(&csl,NIO_COLOR_BLACK,NIO_COLOR_WHITE);
nio_printf("                        Contact                      ");
nio_color(&csl,NIO_COLOR_WHITE,NIO_COLOR_BLACK);
//Search
nio_printf("Name search: ");
char output[90] = {0};
nio_getsn(output,90);
uart_printf("$#$UPDATENUM:%s\r\n",output);

nio_color(&csl,NIO_COLOR_BLACK,NIO_COLOR_WHITE);
nio_clear(&csl);
while(!uart_ready() && !isKeyPressed(KEY_NSPIRE_ESC)) {
nio_printf("                        Waiting                      ");
sleep(500);
}
nio_color(&csl,NIO_COLOR_BLACK,NIO_COLOR_WHITE);
nio_printf("                        Contact                      ");
nio_color(&csl,NIO_COLOR_WHITE,NIO_COLOR_BLACK);
nio_clear(&csl);

char input[1024] = {0};
//sleep(500);
uart_getsn_mdf(input,1024);

nio_puts(input);
nio_puts("Select your contact:");

contact = input;

        char* namestable[1024];
        char* s;
        int i=0;
        s = strtok(contact ,"|");
        while (s != NULL) {
        if(i>1) {
namestable[i] = s;
}
        if(i>2) {
        nio_printf("  %i) %s. \r\n",i-3,s);
                }
                s = strtok (NULL, "|");
                i++;
        }
        nio_printf("Change contact to (n)?");
        char selected[10] = {0};
        nio_getsn(selected,10);
        int ii = atoi(selected);
ii=ii+3;
        if(ii >= 0 && namestable[ii] != "None") {
                nio_printf("Changing send contact to %s. \r\n",namestable[ii]);
uart_printf("$#$CHANGENUM:%s\r\n",namestable[ii]);
hasSelectedContact = 1;
nio_clear(&csl);
nio_color(&csl,NIO_COLOR_BLACK,NIO_COLOR_WHITE);
// Display reponsive title
nio_printf(" Info: Now chating with: %s \r\n", namestable[ii]);
nio_printf("                                                     ");
nio_puts("");
        } else {
hasSelectedContact = 0;
nio_clear(&csl);
nio_color(&csl,NIO_COLOR_BLACK,NIO_COLOR_LIGHTRED);
nio_printf("                                                     ");
nio_printf("  Error: Error while selecting contact please retry. ");
nio_printf("          If the error persist contact samy :)       ");
nio_printf("                                                     ");
nio_color(&csl,NIO_COLOR_WHITE,NIO_COLOR_BLACK);
nio_puts("");
        }
nio_color(&csl,NIO_COLOR_WHITE,NIO_COLOR_BLACK);
        // END Contact select part
key_already_pressed_contact = 1;
}
if(!any_key_pressed()) {
key_already_pressed_ctrl = 0;
key_already_pressed_contact = 0;
}
if(uart_ready()) {
sleep(500);
char input[1024] = {0};
uart_gets_mdf(input);
contact = input;
nio_printf("%s\r\n",input);
nio_printf("%s",input);
nio_puts("");
}
}

//Send that we are offline
uart_printf("#$#CALC:LEAVING:SMS\r\n");

//Exiting
nio_puts("Offline message sended. Exiting ...");
nio_free(&csl);
return 0;
}



For those who doesn't want to understand all of my code here is the part where I get my messages:

if(uart_ready()) {
sleep(500);
char input[1024] = {0};
uart_gets_mdf(input);
nio_printf("%s",input);
nio_puts("");
}


And here are the modified function:

char* uart_getsn_mdf(char* str, int num) {
for(int i = 0; i < num-1; i++){
if(uart_ready()) {
char c = uart_getchar();
str[i] = c;
if(c == '\b'){ i -= 2; }
else if(c == '\r') { str[i] =0; return str; }
}
}
str[num] = 0;
return str;
}

char* uart_gets_mdf(char* str)
{
        return uart_getsn_mdf(str,50);
}


If somebody wanna help me I'm taking it.
PS: I'm french so sorry for mistakes