CAT.1开发|4G连接阿里云物联网平台

前言

使用4G模组二次开发，实现阿里云物联网平台的连接。当前MCU是越来越贵，无奈只能使用模组二次开发，模组的资源是相当丰富，flash和ram都是兆级别的，可用空间很大。唯一的不足就是外设不多。阿里云物联网平台还算比较稳定，项目上使用确实不错。

硬件准备

1.广和通L610模组(opencpu,二次开发)

参考文档

设备接入 - 阿里云物联网平台 - 阿里云

代码实现

1.签名计算sign_sha256.c

/** Copyright (C) 2015-2018 Alibaba Group Holding Limited*/#define INFRA_SHA256_SMALLER#include <stdint.h>
#include <stdlib.h>
#include <string.h>#define SHA256_DIGEST_LENGTH            (32)
#define SHA256_BLOCK_LENGTH             (64)
#define SHA256_SHORT_BLOCK_LENGTH       (SHA256_BLOCK_LENGTH - 8)
#define SHA256_DIGEST_STRING_LENGTH     (SHA256_DIGEST_LENGTH * 2 + 1)/*** \brief          SHA-256 context structure*/
typedef struct {uint32_t total[2];          /*!< number of bytes processed  */uint32_t state[8];          /*!< intermediate digest state  */unsigned char buffer[64];   /*!< data block being processed */int is224;                  /*!< 0 => SHA-256, else SHA-224 */
} iot_sha256_context;typedef union {char sptr[8];uint64_t lint;
} u_retLen;#define SHA256_KEY_IOPAD_SIZE   (64)
#define SHA256_DIGEST_SIZE      (32)/** 32-bit integer manipulation macros (big endian)*/
#ifndef GET_UINT32_BE
#define GET_UINT32_BE(n,b,i)                            \do {                                                    \(n) = ( (uint32_t) (b)[(i)    ] << 24 )             \| ( (uint32_t) (b)[(i) + 1] << 16 )             \| ( (uint32_t) (b)[(i) + 2] <<  8 )             \| ( (uint32_t) (b)[(i) + 3]       );            \} while( 0 )
#endif#ifndef PUT_UINT32_BE
#define PUT_UINT32_BE(n,b,i)                            \do {                                                    \(b)[(i)    ] = (unsigned char) ( (n) >> 24 );       \(b)[(i) + 1] = (unsigned char) ( (n) >> 16 );       \(b)[(i) + 2] = (unsigned char) ( (n) >>  8 );       \(b)[(i) + 3] = (unsigned char) ( (n)       );       \} while( 0 )
#endifstatic void utils_sha256_zeroize(void *v, uint32_t n)
{volatile unsigned char *p = v;while (n--) {*p++ = 0;}
}void utils_sha256_init(iot_sha256_context *ctx)
{memset(ctx, 0, sizeof(iot_sha256_context));
}void utils_sha256_free(iot_sha256_context *ctx)
{if (NULL == ctx) {return;}utils_sha256_zeroize(ctx, sizeof(iot_sha256_context));
}void utils_sha256_starts(iot_sha256_context *ctx)
{int is224 = 0;ctx->total[0] = 0;ctx->total[1] = 0;if (is224 == 0) {/* SHA-256 */ctx->state[0] = 0x6A09E667;ctx->state[1] = 0xBB67AE85;ctx->state[2] = 0x3C6EF372;ctx->state[3] = 0xA54FF53A;ctx->state[4] = 0x510E527F;ctx->state[5] = 0x9B05688C;ctx->state[6] = 0x1F83D9AB;ctx->state[7] = 0x5BE0CD19;}ctx->is224 = is224;
}static const uint32_t K[] = {0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2,
};#define  SHR(x,n) ((x & 0xFFFFFFFF) >> n)
#define ROTR(x,n) (SHR(x,n) | (x << (32 - n)))#define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^  SHR(x, 3))
#define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^  SHR(x,10))#define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22))
#define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25))#define F0(x,y,z) ((x & y) | (z & (x | y)))
#define F1(x,y,z) (z ^ (x & (y ^ z)))#define R(t)                                    \(                                               \W[t] = S1(W[t -  2]) + W[t -  7] +          \S0(W[t - 15]) + W[t - 16]            \)#define P(a,b,c,d,e,f,g,h,x,K)                  \{                                               \temp1 = h + S3(e) + F1(e,f,g) + K + x;      \temp2 = S2(a) + F0(a,b,c);                  \d += temp1; h = temp1 + temp2;              \}void utils_sha256_process(iot_sha256_context *ctx, const unsigned char data[64])
{uint32_t temp1, temp2, W[64];uint32_t A[8];unsigned int i;for (i = 0; i < 8; i++) {A[i] = ctx->state[i];}#if defined(INFRA_SHA256_SMALLER)for (i = 0; i < 64; i++) {if (i < 16) {GET_UINT32_BE(W[i], data, 4 * i);} else {R(i);}P(A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i], K[i]);temp1 = A[7];A[7] = A[6];A[6] = A[5];A[5] = A[4];A[4] = A[3];A[3] = A[2];A[2] = A[1];A[1] = A[0];A[0] = temp1;}
#else /* INFRA_SHA256_SMALLER */for (i = 0; i < 16; i++) {GET_UINT32_BE(W[i], data, 4 * i);}for (i = 0; i < 16; i += 8) {P(A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i + 0], K[i + 0]);P(A[7], A[0], A[1], A[2], A[3], A[4], A[5], A[6], W[i + 1], K[i + 1]);P(A[6], A[7], A[0], A[1], A[2], A[3], A[4], A[5], W[i + 2], K[i + 2]);P(A[5], A[6], A[7], A[0], A[1], A[2], A[3], A[4], W[i + 3], K[i + 3]);P(A[4], A[5], A[6], A[7], A[0], A[1], A[2], A[3], W[i + 4], K[i + 4]);P(A[3], A[4], A[5], A[6], A[7], A[0], A[1], A[2], W[i + 5], K[i + 5]);P(A[2], A[3], A[4], A[5], A[6], A[7], A[0], A[1], W[i + 6], K[i + 6]);P(A[1], A[2], A[3], A[4], A[5], A[6], A[7], A[0], W[i + 7], K[i + 7]);}for (i = 16; i < 64; i += 8) {P(A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], R(i + 0), K[i + 0]);P(A[7], A[0], A[1], A[2], A[3], A[4], A[5], A[6], R(i + 1), K[i + 1]);P(A[6], A[7], A[0], A[1], A[2], A[3], A[4], A[5], R(i + 2), K[i + 2]);P(A[5], A[6], A[7], A[0], A[1], A[2], A[3], A[4], R(i + 3), K[i + 3]);P(A[4], A[5], A[6], A[7], A[0], A[1], A[2], A[3], R(i + 4), K[i + 4]);P(A[3], A[4], A[5], A[6], A[7], A[0], A[1], A[2], R(i + 5), K[i + 5]);P(A[2], A[3], A[4], A[5], A[6], A[7], A[0], A[1], R(i + 6), K[i + 6]);P(A[1], A[2], A[3], A[4], A[5], A[6], A[7], A[0], R(i + 7), K[i + 7]);}
#endif /* INFRA_SHA256_SMALLER */for (i = 0; i < 8; i++) {ctx->state[i] += A[i];}
}
void utils_sha256_update(iot_sha256_context *ctx, const unsigned char *input, uint32_t ilen)
{size_t fill;uint32_t left;if (ilen == 0) {return;}left = ctx->total[0] & 0x3F;fill = 64 - left;ctx->total[0] += (uint32_t) ilen;ctx->total[0] &= 0xFFFFFFFF;if (ctx->total[0] < (uint32_t) ilen) {ctx->total[1]++;}if (left && ilen >= fill) {memcpy((void *)(ctx->buffer + left), input, fill);utils_sha256_process(ctx, ctx->buffer);input += fill;ilen  -= fill;left = 0;}while (ilen >= 64) {utils_sha256_process(ctx, input);input += 64;ilen  -= 64;}if (ilen > 0) {memcpy((void *)(ctx->buffer + left), input, ilen);}
}static const unsigned char sha256_padding[64] = {0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};void utils_sha256_finish(iot_sha256_context *ctx, uint8_t output[32])
{uint32_t last, padn;uint32_t high, low;unsigned char msglen[8];high = (ctx->total[0] >> 29)| (ctx->total[1] <<  3);low  = (ctx->total[0] <<  3);PUT_UINT32_BE(high, msglen, 0);PUT_UINT32_BE(low,  msglen, 4);last = ctx->total[0] & 0x3F;padn = (last < 56) ? (56 - last) : (120 - last);utils_sha256_update(ctx, sha256_padding, padn);utils_sha256_update(ctx, msglen, 8);PUT_UINT32_BE(ctx->state[0], output,  0);PUT_UINT32_BE(ctx->state[1], output,  4);PUT_UINT32_BE(ctx->state[2], output,  8);PUT_UINT32_BE(ctx->state[3], output, 12);PUT_UINT32_BE(ctx->state[4], output, 16);PUT_UINT32_BE(ctx->state[5], output, 20);PUT_UINT32_BE(ctx->state[6], output, 24);if (ctx->is224 == 0) {PUT_UINT32_BE(ctx->state[7], output, 28);}
}void utils_sha256(const uint8_t *input, uint32_t ilen, uint8_t output[32])
{iot_sha256_context ctx;utils_sha256_init(&ctx);utils_sha256_starts(&ctx);utils_sha256_update(&ctx, input, ilen);utils_sha256_finish(&ctx, output);utils_sha256_free(&ctx);
}void utils_hmac_sha256(const uint8_t *msg, uint32_t msg_len, const uint8_t *key, uint32_t key_len, uint8_t output[32])
{iot_sha256_context context;uint8_t k_ipad[SHA256_KEY_IOPAD_SIZE];    /* inner padding - key XORd with ipad  */uint8_t k_opad[SHA256_KEY_IOPAD_SIZE];    /* outer padding - key XORd with opad */int32_t i;if ((NULL == msg) || (NULL == key) || (NULL == output)) {return;}if (key_len > SHA256_KEY_IOPAD_SIZE) {return;}/* start out by storing key in pads */memset(k_ipad, 0, sizeof(k_ipad));memset(k_opad, 0, sizeof(k_opad));memcpy(k_ipad, key, key_len);memcpy(k_opad, key, key_len);/* XOR key with ipad and opad values */for (i = 0; i < SHA256_KEY_IOPAD_SIZE; i++) {k_ipad[i] ^= 0x36;k_opad[i] ^= 0x5c;}/* perform inner SHA */utils_sha256_init(&context);                                      /* init context for 1st pass */utils_sha256_starts(&context);                                    /* setup context for 1st pass */utils_sha256_update(&context, k_ipad, SHA256_KEY_IOPAD_SIZE);     /* start with inner pad */utils_sha256_update(&context, msg, msg_len);                      /* then text of datagram */utils_sha256_finish(&context, output);                            /* finish up 1st pass *//* perform outer SHA */utils_sha256_init(&context);                              /* init context for 2nd pass */utils_sha256_starts(&context);                            /* setup context for 2nd pass */utils_sha256_update(&context, k_opad, SHA256_KEY_IOPAD_SIZE);    /* start with outer pad */utils_sha256_update(&context, output, SHA256_DIGEST_SIZE);     /* then results of 1st hash */utils_sha256_finish(&context, output);                       /* finish up 2nd pass */
}

2.使用计算后的 mqtt 信息连接平台

typedef struct {char hostname[DEV_SIGN_HOSTNAME_MAXLEN];uint16_t port;char clientid[DEV_SIGN_CLIENT_ID_MAXLEN];char username[DEV_SIGN_USERNAME_MAXLEN];char password[DEV_SIGN_PASSWORD_MAXLEN];} iotx_sign_mqtt_t;

    int ret;ret = fibo_mqtt_connect(sign_mqtt.clientid, (char *)sign_mqtt.hostname, sign_mqtt.port, 1, keepalive, UseTls);if (ret < 0){return STATE_CTR_RETRY; }return 0;

结果展示

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